This test procedure is only applicable to applications with a coolant level sensor installed.
If you suspect any fault in the coolant level sensor circuit, use this procedure to troubleshoot.
The coolant level sensor monitors the engine coolant level to warn the operator when the coolant level is low.
When the probe is not immersed in coolant, supply approximately +5 VDC to the sensor signal line. When the Electronic Control Module (ECM) detects this, it will activate an event code.
Before troubleshooting any faults in the coolant level sensor, use electronic service tools to check the sensor’s installation status. The coolant level sensor’s configuration parameter must be set to “Installed” for the ECM to monitor the signal from the sensor.
The activation of the event code and/or warning light may be caused by a low coolant level. Other possible causes include a faulty wiring harness, connector, or sensor.
WARNING!
Contact with high-pressure fuel may result in liquid leakage and burn hazards. High-pressure fuel spills may cause a fire. Failure to follow inspection, maintenance, and repair guidelines may result in personal injury or death.
1. Check Coolant Level
A. Disconnect the ECM from power.
B. Check the coolant level. Refer to the Operation and Maintenance Manual for the correct procedures for checking the coolant level.
Result: Low coolant level.
Repair: Add coolant following the steps in the Operation and Maintenance Manual.
The cooling system may be leaking. Identify the source of the coolant leak. Repair the leak. For more information, refer to System Operation/Testing and Adjustment, “Cooling System”.
Result: Coolant is at the correct level.
Proceed to Test Step 2.
2. Verify that the “Coolant Level Sensor” parameters are correctly programmed.
A. Connect the electronic repair tool to the diagnostic connector.
B. Establish communication with the ECM.
C. Confirm that the “Coolant Level Sensor” parameter programming setting is “Installed”.
D. Disconnect the ECM power supply.
Result: The “Coolant Level Sensor” parameter programming setting is incorrect. Repair: Reprogram the “Coolant Level Sensor” parameter to correct.
“Installed”.
The fault was confirmed to be resolved after the repair.
Result: The “Coolant Level Sensor” parameter programming setting is correct.
Proceed to test step 3.
3. Check the power supply voltage at the sensor connector.
A. Disconnect the coolant level sensor from the sensor connector.
B. Restore the ECM power supply.
C. Measure the voltage between terminal A (sensor power) and terminal B (sensor circuit) on the coolant level sensor wiring harness connector.
D. Disconnect the ECM power supply.
Result: The voltage measurement was not 8.0 ± 0.5 VDC.
Repair: The sensor power supply voltage did not reach the sensor. The sensor power supply circuit is faulty. Repair the wiring between the sensor and the ECM.
Result: The voltage measurement was 8.0 ± 0.5 VDC.
The sensor has the correct power supply voltage. Continue testing step 4.
4. Short-circuit the signal line to ground and monitor the status of “Coolant Level”.
A. Create a jumper wire long enough to establish a short circuit between the two terminals of the coolant level sensor harness connector. Crimp connector pins at both ends of the jumper wire. The fault was resolved after repair.
B. Install a jumper wire between terminals B (sensor circuit) and C (sensor signal) of the coolant level sensor harness connector.
C. Restore power to the ECM.
D. After connecting the jumper wire, monitor the “Coolant Level” status on the electronic repair tool. Wait at least 30 seconds for the status indicator to activate.
E. Remove the jumper wire. Connect the coolant level sensor wiring harness connector.
Result: With the jumper wire installed, the status changes from “LOW” to “OK”. The ECM and the wiring harness leading to the coolant level sensor are normal.
Repair: Replace the coolant level sensor. Confirm.
The fault is resolved after repair.
Result: With the jumper wire installed, the status does not change from “LOW” to “OK”.
Repair: There is a fault between the ECM and the sensor connector. Repair the wiring. Confirm the fault is resolved after repair.
If the fault persists, please contact the Distributor Solution Network (DSN).
Rúhé páichú caterpillar320E EXCAVATOR AWS lěngquè yè yè wèi chuángǎnqì diànlù cúnzài de gùzhàng cǐ cèshì bùzhòu jǐn shìyòng yú ānzhuāng yǒu lěngquè yè yè wèi chuángǎnqì de yìngyòng. Rúguǒ huáiyí lěngquè yè yè wèi chuángǎnqì diànlù cúnzài rènhé gùzhàng, qǐng shǐyòng cǐ bùzhòu jìnxíng gùzhàng páichú. Lěngquè yè yè wèi chuángǎnqì jiānshì fādòngjī lěngquè yè yè wèi, yǐbiàn zài lěngquè yè yè wèi dī shí jǐnggào cāozuò yuán. Dāng tàntóu bù jìnrù lěngquè yè zhòng shí, wèi chuángǎnqì xìnhào xiàn tígōng dàyuē +5 VDC de diànyuán. Dāng diànzǐ kòngzhì mókuài (ECM) jiǎncè dào zhè zhǒng qíngkuàng shí, tā jiāng huì jīhuó yīgè shìjiàn dàimǎ. Duì lěngquè yè yè wèi chuángǎnqì de rènhé gùzhàng jìnxíng gùzhàng páichú qián, shǐyòng diànzǐ wéixiū gōngjù jiǎnchá chuángǎnqì de ānzhuāng zhuàng tài. Lěngquè yè yè wèi chuángǎnqì de pèizhì cānshù bìxū shè dìng wèi”Installed(yǐ ānzhuāng)” ,ECM cáinéng jiānshì láizì chuángǎnqì de xìnhào. Shìjiàn dàimǎ hé/huò jǐnggào dēng de jīhuó kěnéng shì yóu lěngquè yè yè wèi dī zàochéng de. Qítā kěnéng yuányīn shì dǎoxiàn xiànshù, jiētóu huò chuángǎnqì yǒu gùzhàng. Jǐnggào! Jiēchù gāoyā rányóu kěnéng dǎozhì yètǐ shèntòu hé shāoshāng wéixiǎn. Gāoyā rányóu yìchū kěnéng huì chǎnshēng huǒzāi. Rúguǒ bù zūnxún jiǎnchá, bǎoyǎng hé wéixiū zhǐnán, kěnéng huì zàochéng rénshēn shāngwáng. 1. Jiǎnchá lěngquè yè yè wèi A. Duàn kāi ECM de diànyuán. B. Jiǎnchá lěngquè yè yè wèi. Guānyú jiǎnchá lěngquè yè yè wèi de zhèngquè bùzhòu, qǐng cānyuè cāozuò hé bǎoyǎng shǒucè. Jiéguǒ: Lěngquè yè yè wèi dī. Xiūlǐ: Ànzhào cāozuò hé bǎoyǎng shǒucè zhōng de bùzhòu tiānjiā lěngquè yè. Lěngquè xìtǒng kěnéng xièlòu. Quèdìng lěngquè yè xièlòu gēnyuán. Xiūfù xièlòu. Guānyú gèng duō xìnxī, cānkǎo xìtǒng cāozuò/cèshì hé tiáozhěng, “lěngquè xì tǒng”. Jiéguǒ: Lěngquè yè chǔyú zhèngquè yè wèi. Zhuǎn zhì cèshì bùzhòu 2. 2. Quèrèn”lěngquè yè yè wèi chuángǎnqì”cānshù jīngguò zhèngquè biānchéng shè dìng A. Jiāng diànzǐ wéixiū gōngjù liánjiē dào zhěnduàn jiētóu shàng. B. Jiànlì yǔ ECM zhī jiān de tōngxìn. C. Quèrèn”lěngquè yè yè wèi chuángǎnqì”cānshù biānchéng shè dìng wèi”Installed(yǐ ānzhuāng)”. D. Duàn kāi ECM de diànyuán. Jiéguǒ: Cānshù”Coolant Level Sensor(lěngquè yè yè wèi chuángǎnqì)”biānchéng shè dìng bùdāng. Xiūlǐ: Jiāng”Coolant Level Sensor(lěngquè yè yè wèi chuángǎnqì)”cānshù biānchéng shè dìng wèi “Installed(yǐ ānzhuāng)”. Quèrèn xiūlǐ hòu gùzhàng páichú. Jiéguǒ: Cānshù”Coolant Level Sensor(lěngquè yè yè wèi chuángǎnqì)”biānchéng shè dìng zhèngquè. Zhuǎn zhì cèshì bùzhòu 3. 3. Jiǎnchá chuángǎnqì jiētóu shàng de diànyuán diànyā A. Duàn kāi chuángǎnqì jiētóu shàng de lěngquè yè yè wèi chuángǎnqì. B. Huīfù ECM de diànyuán. C. Cèliáng lěngquè yè yè wèi chuángǎnqì xiànshù jiētóu shàng jiēxiàn duān A(chuángǎnqì diànyuán) hé jiēxiàn duān B (chuángǎnqì huílù) zhī jiān de diànyā. D. Duàn kāi ECM de diànyuán. Jiéguǒ: Diànyā cèliáng zhí bìngfēi 8.0 ± 0.5 VDC. Xiūlǐ: Chuángǎnqì diànyuán diànyā wèi dàodá chuán gǎn qì. Chuángǎnqì diànyuán diànlù yǒu gùzhàng. Xiūlǐ chuángǎnqì hé ECM zhī jiān de pèi xiàn. Jiéguǒ: Diànyā cèliáng zhí wèi 8.0 ± 0.5 VDC. Chuángǎnqì shàng yǒu zhèngquè de diànyuán diànyā. Jìxù cèshì bùzhòu 4. 4. Jiāng xìnhào xiàn duǎn jiē zhì jiēdì bìng jiānkòng “Coolant Level(lěngquè yè yè wèi)”de zhuàngtài A. Zhìzuò yītiáo kuà jiē dǎoxiàn, qí chángdù zúyǐ zài lěngquè yè yè wèi chuángǎnqì xiànshù jiētóu de liǎng jiēxiàn duān jiān jiànlì duǎnlù. Zài kuà jiē dǎoxiàn liǎng duān yā jiē jiētóu chù zhēn. Xiūlǐ hòu gùzhàng páichú. Duān jiān jiànlì duǎnlù. Zài kuà jiē dǎoxiàn liǎng duān yā jiē jiētóu chù zhēn. B. Zài lěngquè yè yè wèi chuángǎnqì xiànshù jiētóu de jiēxiàn duān B(chuángǎnqì huílù) hé C(chuángǎnqì xìnhào) zhī jiān ānzhuāng kuà jiē dǎoxiàn. C. Huīfù ECM de diànyuán. D. Liánjiē kuà jiē dǎoxiàn hòu, jiānshì diànzǐ wéixiū gōng jù shàng”lěngquè yè yè wèi”de zhuàngtài. Zhìshǎo děngdài 30 miǎo zhōng, yǐbiàn shǐ zhuàngtài zhǐshì qì qǐdòng. E. Chāi xià kuà jiē dǎoxiàn. Liánjiē lěngquè yè yè wèi chuángǎnqì xiànshù jiētóu. Jiéguǒ: Kuà jiē dǎoxiàn ānzhuāng shí, zhuàngtài cóng “LOW(dī)”biàn wèi”OK(zhèngcháng)”. ECM hé tōng xiàng lěngquè yè yè wèi chuángǎnqì de pèi xiàn xiànshù zhèngcháng. Xiūlǐ: Gēnghuàn lěngquè yè yè wèi chuángǎnqì. Quèrèn xiūlǐ hòu gùzhàng páichú. Jiéguǒ: Kuà jiē dǎoxiàn ānzhuāng shí, zhuàngtài bù cóng “LOW(dī)”biàn wèi”OK(zhèngcháng)”. Xiūlǐ:ECM hé chuángǎnqì jiētóu zhī jiān cúnzài gùzhàng. Xiūlǐ pèi xiàn. Quèrèn xiūlǐ hòu gùzhàng pái chú. Rúguǒ gùzhàng réngrán cúnzài, qǐng liánxì dàilǐ shāng jiě jué fāng’àn wǎngluò (DSN).
How to Troubleshoot a Caterpillar 320E Excavator AWS Coolant Level Sensor Circuit This test procedure is only applicable to applications with a coolant level sensor installed. If you suspect any fault in the coolant level sensor circuit, use this procedure to troubleshoot. The coolant level sensor monitors the engine coolant level to warn the operator when the coolant level is low. When the probe is not immersed in coolant, supply approximately +5 VDC to the sensor signal line. When the Electronic Control Module (ECM) detects this, it will activate an event code. Before troubleshooting any faults in the coolant level sensor, use electronic service tools to check the sensor’s installation status. The coolant level sensor’s configuration parameter must be set to “Installed” for the ECM to monitor the signal from the sensor. The activation of the event code and/or warning light may be caused by a low coolant level. Other possible causes include a faulty wiring harness, connector, or sensor. WARNING! Contact with high-pressure fuel may result in liquid leakage and burn hazards. High-pressure fuel spills may cause a fire. Failure to follow inspection, maintenance, and repair guidelines may result in personal injury or death. 1. Check Coolant Level A. Disconnect the ECM from power. B. Check the coolant level. Refer to the Operation and Maintenance Manual for the correct procedures for checking the coolant level. Result: Low coolant level. Repair: Add coolant following the steps in the Operation and Maintenance Manual. The cooling system may be leaking. Identify the source of the coolant leak. Repair the leak. For more information, refer to System Operation/Testing and Adjustment, “Cooling System”. Result: Coolant is at the correct level. Proceed to Test Step 2. 2. Verify that the “Coolant Level Sensor” parameters are correctly programmed. A. Connect the electronic repair tool to the diagnostic connector. B. Establish communication with the ECM. C. Confirm that the “Coolant Level Sensor” parameter programming setting is “Installed”. D. Disconnect the ECM power supply. Result: The “Coolant Level Sensor” parameter programming setting is incorrect. Repair: Reprogram the “Coolant Level Sensor” parameter to “Installed”.
Rúhé páichú caterpillar320E EXCAVATOR AWS lěngquè yè yè wèi chuángǎnqì diànlù cúnzài de gùzhàng cǐ cèshì bùzhòu jǐn shìyòng yú ānzhuāng yǒu lěngquè yè yè wèi chuángǎnqì de yìngyòng. Rúguǒ huáiyí lěngquè yè yè wèi chuángǎnqì diànlù cúnzài rènhé gùzhàng, qǐng shǐyòng cǐ bùzhòu jìnxíng gùzhàng páichú. Lěngquè yè yè wèi chuángǎnqì jiānshì fādòngjī lěngquè yè yè wèi, yǐbiàn zài lěngquè yè yè wèi dī shí jǐnggào cāozuò yuán. Dāng tàntóu bù jìnrù lěngquè yè zhòng shí, wèi chuángǎnqì xìnhào xiàn tígōng dàyuē +5 VDC de diànyuán. Dāng diànzǐ kòngzhì mókuài (ECM) jiǎncè dào zhè zhǒng qíngkuàng shí, tā jiāng huì jīhuó yīgè shìjiàn dàimǎ. Duì lěngquè yè yè wèi chuángǎnqì de rènhé gùzhàng jìnxíng gùzhàng páichú qián, shǐyòng diànzǐ wéixiū gōngjù jiǎnchá chuángǎnqì de ānzhuāng zhuàng tài. Lěngquè yè yè wèi chuángǎnqì de pèizhì cānshù bìxū shè dìng wèi”Installed(yǐ ānzhuāng)” ,ECM cáinéng jiānshì láizì chuángǎnqì de xìnhào. Shìjiàn dàimǎ hé/huò jǐnggào dēng de jīhuó kěnéng shì yóu lěngquè yè yè wèi dī zàochéng de. Qítā kěnéng yuányīn shì dǎoxiàn xiànshù, jiētóu huò chuángǎnqì yǒu gùzhàng. Jǐnggào! Jiēchù gāoyā rányóu kěnéng dǎozhì yètǐ shèntòu hé shāoshāng wéixiǎn. Gāoyā rányóu yìchū kěnéng huì chǎnshēng huǒzāi. Rúguǒ bù zūnxún jiǎnchá, bǎoyǎng hé wéixiū zhǐnán, kěnéng huì zàochéng rénshēn shāngwáng. 1. Jiǎnchá lěngquè yè yè wèi A. Duàn kāi ECM de diànyuán. B. Jiǎnchá lěngquè yè yè wèi. Guānyú jiǎnchá lěngquè yè yè wèi de zhèngquè bùzhòu, qǐng cānyuè cāozuò hé bǎoyǎng shǒucè. Jiéguǒ: Lěngquè yè yè wèi dī. Xiūlǐ: Ànzhào cāozuò hé bǎoyǎng shǒucè zhōng de bùzhòu tiānjiā lěngquè yè. Lěngquè xìtǒng kěnéng xièlòu. Quèdìng lěngquè yè xièlòu gēnyuán. Xiūfù xièlòu. Guānyú gèng duō xìnxī, cānkǎo xìtǒng cāozuò/cèshì hé tiáozhěng, “lěngquè xì tǒng”. Jiéguǒ: Lěngquè yè chǔyú zhèngquè yè wèi. Zhuǎn zhì cèshì bùzhòu 2. 2. Quèrèn”lěngquè yè yè wèi chuángǎnqì”cānshù jīngguò zhèngquè biānchéng shè dìng A. Jiāng diànzǐ wéixiū gōngjù liánjiē dào zhěnduàn jiētóu shàng. B. Jiànlì yǔ ECM zhī jiān de tōngxìn. C. Quèrèn”lěngquè yè yè wèi chuángǎnqì”cānshù biānchéng shè dìng wèi”Installed(yǐ ānzhuāng)”. D. Duàn kāi ECM de diànyuán. Jiéguǒ: Cānshù”Coolant Level Sensor(lěngquè yè yè wèi chuángǎnqì)”biānchéng shè dìng bùdāng. Xiūlǐ: Jiāng”Coolant Level Sensor(lěngquè yè yè wèi chuángǎnqì)”cānshù biānchéng shè dìng wèi “Installed(yǐ ānzhuāng)”. Quèrèn xiūlǐ hòu gùzhàng páichú. Jiéguǒ: Cānshù”Coolant Level Sensor(lěngquè yè yè wèi chuángǎnqì)”biānchéng shè dìng zhèngquè. Zhuǎn zhì cèshì bùzhòu 3. 3. Jiǎnchá chuángǎnqì jiētóu shàng de diànyuán diànyā A. Duàn kāi chuángǎnqì jiētóu shàng de lěngquè yè yè wèi chuángǎnqì. B. Huīfù ECM de diànyuán. C. Cèliáng lěngquè yè yè wèi chuángǎnqì xiànshù jiētóu shàng jiēxiàn duān A(chuángǎnqì diànyuán) hé jiēxiàn duān B (chuángǎnqì huílù) zhī jiān de diànyā. D. Duàn kāi ECM de diànyuán. Jiéguǒ: Diànyā cèliáng zhí bìngfēi 8.0 ± 0.5 VDC. Xiūlǐ: Chuángǎnqì diànyuán diànyā wèi dàodá chuán gǎn qì. Chuángǎnqì diànyuán diànlù yǒu gùzhàng. Xiūlǐ chuángǎnqì hé ECM zhī jiān de pèi xiàn. Jiéguǒ: Diànyā cèliáng zhí wèi 8.0 ± 0.5 VDC. Chuángǎnqì shàng yǒu zhèngquè de diànyuán diànyā. Jìxù cèshì bùzhòu 4. 4. Jiāng xìnhào xiàn duǎn jiē zhì jiēdì bìng jiānkòng “Coolant Level(lěngquè yè yè wèi)”de zhuàngtài A. Zhìzuò yītiáo kuà jiē dǎoxiàn, qí chángdù zúyǐ zài lěngquè yè yè wèi chuángǎnqì xiànshù jiētóu de liǎng jiēxiàn duān jiān jiànlì duǎnlù. Zài kuà jiē dǎoxiàn liǎng duān yā jiē jiētóu chù zhēn. Xiūlǐ hòu gùzhàng páichú. Duān jiān jiànlì duǎnlù. Zài kuà jiē dǎoxiàn liǎng duān yā jiē jiētóu chù zhēn. B. Zài lěngquè yè yè wèi chuángǎnqì xiànshù jiētóu de jiēxiàn duān B(chuángǎnqì huílù) hé C(chuángǎnqì xìnhào) zhī jiān ānzhuāng kuà jiē dǎoxiàn. C. Huīfù ECM de diànyuán. D. Liánjiē kuà jiē dǎoxiàn hòu, jiānshì diànzǐ wéixiū gōng jù shàng”lěngquè yè yè wèi”de zhuàngtài. Zhìshǎo děngdài 30 miǎo zhōng, yǐbiàn shǐ zhuàngtài zhǐshì qì qǐdòng. E. Chāi xià kuà jiē dǎoxiàn. Liánjiē lěngquè yè yè wèi chuángǎnqì xiànshù jiētóu. Jiéguǒ: Kuà jiē dǎoxiàn ānzhuāng shí, zhuàngtài cóng “LOW(dī)”biàn wèi”OK(zhèngcháng)”. ECM hé tōng xiàng lěngquè yè yè wèi chuángǎnqì de pèi xiàn xiànshù zhèngcháng. Xiūlǐ: Gēnghuàn lěngquè yè yè wèi chuángǎnqì. Quèrèn xiūlǐ hòu gùzhàng páichú. Jiéguǒ: Kuà jiē dǎoxiàn ānzhuāng shí, zhuàngtài bù cóng “LOW(dī)”biàn wèi”OK(zhèngcháng)”. Xiūlǐ:ECM hé chuángǎnqì jiētóu zhī jiān cúnzài gùzhàng. Xiūlǐ pèi xiàn. Quèrèn xiūlǐ hòu gùzhàng pái chú. Rúguǒ gùzhàng réngrán cúnzài, qǐng liánxì dàilǐ shāng jiě jué fāng’àn wǎngluò (DSN).
How to Troubleshoot a Caterpillar 320E Excavator AWS Coolant Level Sensor Circuit This test procedure is only applicable to applications with a coolant level sensor installed. If you suspect any fault in the coolant level sensor circuit, use this procedure to troubleshoot. The coolant level sensor monitors the engine coolant level to warn the operator when the coolant level is low. When the probe is not immersed in coolant, supply approximately +5 VDC to the sensor signal line. When the Electronic Control Module (ECM) detects this, it will activate an event code. Before troubleshooting any faults in the coolant level sensor, use electronic service tools to check the sensor’s installation status. The coolant level sensor’s configuration parameter must be set to “Installed” for the ECM to monitor the signal from the sensor. The activation of the event code and/or warning light may be caused by a low coolant level. Other possible causes include a faulty wiring harness, connector, or sensor. WARNING! Contact with high-pressure fuel may result in liquid leakage and burn hazards. High-pressure fuel spills may cause a fire. Failure to follow inspection, maintenance, and repair guidelines may result in personal injury or death. 1. Check Coolant Level A. Disconnect the ECM from power. B. Check the coolant level. Refer to the Operation and Maintenance Manual for the correct procedures for checking the coolant level. Result: Low coolant level. Repair: Add coolant following the steps in the Operation and Maintenance Manual. The cooling system may be leaking. Identify the source of the coolant leak. Repair the leak. For more information, refer to System Operation/Testing and Adjustment, “Cooling System”. Result: Coolant is at the correct level. Proceed to Test Step 2. 2. Verify that the “Coolant Level Sensor” parameters are correctly programmed. A. Connect the electronic repair tool to the diagnostic connector. B. Establish communication with the ECM. C. Confirm that the “Coolant Level Sensor” parameter programming setting is “Installed”. D. Disconnect the ECM power supply. Result: The “Coolant Level Sensor” parameter programming setting is incorrect. Repair: Reprogram the “Coolant Level Sensor” parameter to “Installed”.
