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HOMESERVICE MANUALSACURA20043.5RLREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - BASIC DIAGNOSTIC PROCEDURESFUEL SYSTEMPGM-FI MAIN RELAY CIRCUIT TESTINGRSX
2004 Acura 3.5RL

PGM-FI Main Relay Circuit Testing: RSX

2004 Acura 3.5RLSECTION RSX
  1. Remove fuel tank filler cap. Listen for fuel pump operation at fuel tank fill port. Fuel pump should operate for 2 seconds after ignition switch is turned on. If fuel pump operates as specified, fuel pump is okay. If fuel pump does not operate as specified, go to next step.
  2. Turn ignition switch off. Remove glove box, then remove PGM-FI main relay No. 2. See Fig 1 . Turn ignition switch on, measure voltage between ground and PGM-FI main relay No. 2 harness connector terminal No. 4 (Yellow/Black wire). If voltage is present, go to next step. If voltage is not present, repair open circuit in Yellow/Black wire between PGM-FI main relay No. 1 and PGM-FI main relay No. 2.
    Fig 1: Identifying PGM-FI Main Relays No. 1 & 2 Terminals (RSX)
    G00070906Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Using a voltmeter connected to ground, check for battery voltage at PGM-FI relay No. 2 harness connector terminal No. 1 (Black/Yellow wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open circuit in Black/Yellow wire between under-dash fuse/relay box fuse No. 17 and PGM-FI main relay No. 2 harness connector. See appropriate wiring diagram under ENGINE PERFORMANCE in WIRING DIAGRAMS. Repair as necessary. Repair as necessary.
  4. Turn ignition switch off. Disconnect White ECM/PCM 31-pin harness connector "E". Using ohmmeter check for continuity between PGM-FI main relay No. 2 harness connector and White ECM/PCM 31-pin harness connector terminal No. 1 (Green/Yellow wire). If continuity is present, go to next step. If continuity is not present, repair open circuit between PGM-FI main relay No. 2 harness connector and White ECM/PCM 31-pin harness connector terminal No. 1 (Green/Yellow wire).
  5. Reinstall PGM-FI main relay No. 2. Turn ignition switch on. Using voltmeter connected to ground, measure voltage at White ECM/PCM 31-pin harness connector terminal No. 1 (Green/Yellow wire). If battery voltage is present, go to next step. If battery voltage is not present, replace PGM-FI main relay No. 2
  6. Turn ignition switch off. Reconnect White ECM/PCM 31-pin harness connector. Turn ignition switch on. Using voltmeter connected to ground, measure voltage at White ECM/PCM 31-pin harness connector terminal No. 1. If battery voltage is present within the first 2 seconds after the ignition key is turned on, update ECM/PCM (if it does not have latest software) or replace with known-good ECM/PCM, then recheck. If symptom goes away, replace original ECM/PCM. If battery voltage was not present, go to next step.
  7. Turn ignition switch off. Remove rear seat cushion. Remove access panel from floor. Using voltmeter connected to ground, measure voltage at fuel pump 5-pin connector terminal No. 5 (Yellow/Blue wire) within the first 2 seconds of turning the ignition switch on. If battery voltage is present, go to step  9 . If battery voltage is not present, go to next step.
  8. Turn ignition switch off. Remove PGM-FI main relay No. 2. Connect fused jumper wire between PGM-FI 4-pin harness connector terminals No. 1 (Black/Yellow wire) and 2 (Yellow/Blue wire). See appropriate wiring diagram under ENGINE PERFORMANCE in WIRING DIAGRAMS. Turn ignition switch on. Using voltmeter connected to ground, measure voltage at fuel pump 5-pin harness connector terminal No. 5 (Yellow/Blue wire) within first 2 seconds after ignition is turned on. If battery voltage was present, replace PGM-FI main relay No. 2. If battery voltage was not present, repair open circuit between PGM-FI main relay No. 2 and fuel pump 5-pin harness connector terminal No. 5 (Yellow/Blue wire).
  9. Turn ignition switch off. Using ohmmeter connected to ground, check for continuity at fuel pump 5-pin harness connector terminal No. 4 (Black wire). If continuity is present, replace fuel pump. If continuity is not present, repair open in Black wire between fuel pump 5-pin harness connector terminal No. 4 (Black wire) and ground terminal G501.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.