Fuel Pump Circuit Troubleshooting (Without ETCS)
Fuel Pump Circuit Troubleshooting
If you suspect a problem with the fuel pump, check that the fuel pump actually runs; when it is ON, you will hear some noise if you listen to the fuel fill port with the fuel fill cap removed. The fuel pump should run for 2 seconds when the ignition switch is first turned on. If the fuel pump does not make noise, check as follows:| 1. | Turn the ignition switch OFF. |
| 2. | Remove the fuse cover. |
| 3. | Remove PGM-FI main relay 2 (A) from the under-dash fuse/relay box.
 A |
| 4. | Turn the ignition switch ON (II). |
| 5. | Measure voltage between PGM-FI main relay 2 4P connector terminal No. 3 and body ground.
 PGM-FI MAIN RELAY 2 4P CONNECTORTerminal side of female terminalsIGP(YEL/BLK) Is there battery voltage? YES - Go to 6. NO - Repair open in the wire between PGM-FI main relay 1 and PGM-FI main relay 2.n |
| 6. | Measure voltage between PGM-FI main relay 2 4P connector terminal No. 1 and body ground.
 PGM-FI MAIN RELAY 2 4P CONNECTORTerminal side of female terminalsIG1(YEL/BLK)*1 (BLK/YEL)*2*1: With inertia switch *2: Without inertia switch Is there battery voltage? YES - Go to 7. NO - Repair open in the wire between the under-dash fuse/relay box and PGM-FI main relay 2.n |
| 7. | Turn the ignition switch OFF. |
| 8. | Disconnect ECM/PCM connector E (31P). |
| 9. | Check for continuity between PGM-FI main relay 2 4P connector terminal No. 4 and ECM/PCM connector terminal E1*1 (E10)*2.
 PGM-FI MAIN RELAY 2 4P CONNECTORECM/PCM CONNECTOR E (31P)IMOFPR(GRN/YEL)*1FPR (GRN/YEL)*2Terminal side of male terminalsWire side of female terminalsIMOFPR (GRN/YEL)*1 FPR (GRN/YEL)2**1: With immobilizer *2: Without immobilizer Is there continuity? YES - Go to 10. NO - Repair open in the wire between PGM-FI main relay 2 and the ECM/PCM (E1*1 (E10)*2).n |
| 10. | Reinstall PGM-FI main relay 2. |
| 11. | Turn the ignition switch ON (II). |
| 12. | Measure voltage between ECM/PCM connector terminal E1*1 (E10)*2 and body ground.
 ECM/PCM CONNECTOR E (31P)Wire side of female terminals*1: With immobilizer*2: Without immobilizerIMOFPR (GRN/YEL)*1FPR (GRN/YEL)*2 Is there battery voltage? YES - Go to 13. NO - Replace PGM-FI main relay 2.n |
| 13. | Turn the ignition switch OFF. |
| 14. | Reconnect ECM/PCM connector E (31P). |
| 15. | Turn the ignition switch ON (II), and measure voltage between ECM/PCM connector terminal E1*1 (E10)*2 and body ground within the first 2 seconds after the ignition switch was turned ON (II).
 ECM/PCM CONNECTOR E (31P)Wire side of female terminals*1: With immobilizer*2: Without immobilizerIMOFPR (GRN/YEL)*1FPR (GRN/YEL)*2 Is there battery voltage? YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/ PCM.n NO - Go to 16. |
| 16. | Turn the ignition switch OFF. |
| 17. | Remove the access panel from the floor. |
| 18. | Measure voltage between the fuel pump 5P connector terminal No. 5 and body ground within the first 2 seconds after the ignition switch was turned ON (II).
 FUEL PUMP 5P CONNECTORFUEL PUMP (YEL/GRN)Wire side of female terminals Is there battery voltage? YES - Go to 25. NO - Go to 19. |
| 19. | Turn the ignition switch OFF. |
| 20. | Remove the fuse cover. |
| 21. | Remove PGM-FI main relay 2 (A) from the under-dash fuse/relay box.
 A |
| 22. | Connect PGM-FI main relay 2 4P connector terminals No. 1 and No. 2 with a jumper wire.
 PGM-FI MAIN RELAY 2 4P CONNECTORTerminal side of female terminalsIG1(YEL/BLK)*1 (BLK/YEL)*2*1: With inertia switch *2: Without inertia switchJUMPER WIREFUEL PUMP (YEL/GRN) |
| 23. | Turn the ignition switch ON (II). |
| 24. | Measure voltage between fuel pump 5P connector terminal No. 5 and body ground within the first 2 seconds after the ignition switch was turned ON (II).
 FUEL PUMP 5P CONNECTORFUEL PUMP (YEL/GRN)Wire side of female terminals Is there battery voltage? YES - Replace PGM-FI main relay 2.n NO - Repair open in the wire between PGM-FI main relay 2 and the fuel pump 5P connector.n |
| 25. | Turn the ignition switch OFF. |
| 26. | Check for continuity between fuel pump 5P connector terminal No. 4 and body ground.
 FUEL PUMP 5P CONNECTORGND (BLK)Wire side of female terminals Is there continuity? YES - Replace the fuel pump.n NO - Repair open in the wire between the fuel pump 5P connector and G402.n |