Honda 2001 Fuel and Emissions11-1
Idle Control System11-139 		Previous Page Next Page


Idle Control System11-139

Component Location Index


*: The illustration shows LHD model.

1

POWER STEERING PRESSURE (PSP) SWITCH

Troubleshooting, page 11-145

2

IDLE AIR CONTROL (IAC) VALVE

Troubleshooting, page 11-140




DTC Troubleshooting11-140

DTC P1519 (14-3): IAC Valve Circuit Malfunction

  1. Reset the ECM/PCM (see page 11-4) .
  2. Turn the ignition switch ON (II).

Is DTC P1519 indicated?

Yes : Go to step 3.

No : Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the IAC valve and at the ECM/PCM.

  1. Turn the ignition switch OFF.
  2. Disconnect the IAC valve 3P connector.
  3. Turn the ignition switch ON (II).
  4. Measure voltage between IAC valve 3P connector terminal No. 2 and body ground.

IAC VALVE 3P CONNECTOR


Wire side of female terminals

Is there battery voltage?

Yes : Go to step 7.

No : Repair open in the wire between the IAC valve and the PGM-FI main relay.

  1. Turn the ignition switch OFF.
  2. Check for continuity between body ground and IAC valve 3P connector terminal No. 1.

IAC VALVE 3P CONNECTOR


Wire side of female terminals

Is there continuity?

Yes : Go to step 9.

No : Repair open in the wire between the IAC valve and G101.

  1. Disconnect the negative cable from the battery.
  2. Disconnect ECM/PCM connector A (31P).
  3. Check for continuity between body ground and ECM/PCM connector terminal A12.

ECM/PCM CONNECTOR A (31P)


Wire side of female terminals

Is there continuity?

Yes : Repair short in the wire between the IAC valve and the ECM/PCM (A12).

No : Go to step 12.

11-141

  1. Connect IAC valve 3P connector terminal No. 3 and body ground with a jumper wire.

IAC VALVE 3P CONNECTOR


Wire side of female terminals

  1. Check for continuity between ECM/PCM connector terminal A12 and body ground.

ECM/PCM CONNECTOR A (31P)


Wire side of female terminals

Is there continuity?

Yes : Go to step 14.

No : Repair open in the wire between the IAC valve and the ECM/PCM (A12).

  1. Reconnect the IAC valve 3P connector.
  2. Reconnect the negative cable to the battery.
  3. Turn the ignition switch ON (II).
  4. Measure voltage between body ground and ECM/PCM connector terminal A12.

ECM/PCM CONNECTOR A (31P)


Wire side of female terminals

Is there battery voltage?

Yes : Substitute a known-good ECM/PCM and recheck (see page 11-5). If symptom/indication goes away, replace the original ECM/PCM.

No : Replace the IAC valve.

A/C Signal Circuit Troubleshooting11-142

  1. Turn the ignition switch ON (II).
  2. Momentarily connect ECM/PCM connector terminals A24 and E18 with a jumper wire several times.

ECM/PCM CONNECTORS


Wire side of female terminals

Is there a clicking noise from the A/C compressor clutch?

Yes : Go to step 3.

No : Go to step 6.

  1. Start the engine.
  2. Turn the blower switch ON.
  3. Turn the A/C switch ON.

Does the A/C operate?

Yes : The air conditioning signal is OK.

No : Substitute a known-good ECM/PCM and recheck (see page 11-5). If symptom/indication goes away, replace the original ECM/PCM.

  1. Momentarily connect the under-hood fuse/relay box 14P connector terminal No. 10 to body ground with a jumper wire several times.

UNDER-HOOD FUSE/RELAY BOX 14P CONNECTOR


Wire side of female terminals

Is there clicking noise from the A/C compressor clutch?

Yes : Repair open in the wire between the ECM/PCM (E18) and the A/C clutch relay.

No : Check the A/C system for other symptoms.

Alternator FR Signal Circuit Troubleshooting11-143

  1. Disconnect the alternator 4P connector.
  2. Turn the ignition switch ON (II).
  3. Measure voltage between ECM/PCM connector terminals A24 and B13.

ECM/PCM CONNECTORS


Wire side of female terminals

Is there about 5 V?

Yes : Go to step 4.

No : Go to step 14.

  1. Turn the ignition switch OFF.
  2. Reconnect the alternator 4P connector.
  3. Start the engine. Hold the engine at 3,000 rpm (min-1) with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Measure voltage between ECM/PCM connector terminals A24 and B13.

Does the voltage decrease when the headlights and rear window defogger are turned on?

Yes : The alternator FR signal is OK.

No : Go to step 8.

  1. Turn the ignition switch OFF.
  2. Disconnect the negative cable from the battery.
  3. Disconnect ECM/PCM connector B (24P).
  4. Disconnect the alternator 4P connector.
  5. Connect alternator 4P connector terminal No. 4 and body ground with a jumper wire.

ALTERNATOR 4P CONNECTOR


Wire side of female terminals

  1. Check for continuity between body ground and ECM/PCM connector terminal B13.

ECM/PCM CONNECTOR A (24P)


Wire side of female terminals

Is there continuity?

Yes : Test the alternator (see page 04-27).

No : Repair open in the wire between the ECM/PCM (B13) and the alternator.

  1. Turn the ignition switch OFF.
  2. Disconnect the negative cable from the battery.
  3. Disconnect ECM/PCM connector B (24P).

Alternator FR Signal Circuit Troubleshooting (cont'd)11-144

  1. Check for continuity between body ground and ECM/PCM connector terminal B13.

ECM/PCM CONNECTOR A (24P)


Wire side of female terminals

Is there continuity?

Yes : Repair short in the wire between the ECM/PCM (B13) and the alternator.

No : Substitute a known-good ECM/PCM and recheck (see page 11-5). If symptom/indication goes away, replace the original ECM/PCM.

PSP Switch Signal Circuit Troubleshooting11-145

  1. Turn the ignition switch ON (II).
  2. Measure voltage between ECM/PCM connector terminals A24 and E16.

ECM/PCM CONNECTORS


Wire side of female terminals

Is there less than 1.0 V?

Yes : Go to step 3.

No : Go to step 6.

  1. Start the engine.
  2. Turn the steering wheel to the full lock position.
  3. Measure voltage between ECM/PCM connector terminals A24 and E16.

Is there battery voltage?

Yes : The PSP switch signal is OK.

No : Go to step 13.

  1. Turn the ignition switch OFF.
  2. Disconnect the PSP switch 2P connector.
  3. Turn the ignition switch ON (II).
  4. At the harness side, connect PSP switch 2P connector terminals No. 1 and No. 2 with a jumper wire.

PSP SWITCH 2P CONNECTOR


Wire side of female terminals

  1. Measure voltage between ECM/PCM connector terminals A24 and E16.

Is there less than 1.0 V?

Yes : Replace the PSP switch.

No : Go to step 11.

  1. Turn the ignition switch OFF.
  2. Check for continuity between PSP switch 2P connector terminal No. 2 and body ground.

PSP SWITCH 2P CONNECTOR


Wire side of female terminals

Is there continuity?

Yes : Repair open in the wire between the PSP switch and ECM/PCM (E16).

No : Repair open in the wire between the PSP switch and G301.

  1. Turn the ignition switch OFF.
  2. Disconnect the PSP switch 2P connector.
  3. Turn the ignition switch ON (II).

PSP Switch Signal Circuit Troubleshooting (cont'd)11-146

  1. Measure voltage between ECM/PCM connector terminals A24 and E16.

ECM/PCM CONNECTORS


Wire side of female terminals

Is there battery voltage?

Yes : Replace the PSP switch.

No : Go to step 17.

  1. Turn the ignition switch OFF.
  2. Disconnect the negative cable from the battery.
  3. Disconnect ECM/PCM connector E (31P).
  4. Check for continuity between body ground and ECM/PCM connector terminal E16.

ECM/PCM CONNECTOR A (31P)


Wire side of female terminals

Is there continuity?

Yes : Repair short in the wire between ECM/PCM (E16) and the PSP switch.

No : Substitute a known-good ECM/PCM and recheck (see page 11-5). If symptom/indication goes away, replace the original ECM/PCM.

Brake Pedal Position Switch Signal Circuit Troubleshooting11-146

  1. Check the brake lights.

Are the brake lights on without pressing the brake pedal?

Yes : Inspect the brake pedal position switch
(see page 19A-5).

No : Go to step 2.

  1. Press the brake pedal.

Do the brake lights come on?

Yes : Go to step 3.

No : Go to step 4.

  1. Measure voltage between ECM/PCM connector terminals A24 and E22 with the brake pedal pressed.

ECM/PCM CONNECTORS


Wire side of female terminals

Is there battery voltage?

Yes : The brake pedal position switch signal is OK.

No : Repair open in the wire between the ECM/PCM (E22) and the brake pedal position switch.

11-147

  1. Inspect the No. 7 HORN, STOP (15A) fuse in the under-hood fuse/relay box.

Is the fuse OK?

Yes : Repair open in the wire between the brake pedal position switch and the No. 7 HORN, STOP (15A) fuse. Inspect the brake pedal position switch (see page 19A-5).

No : Repair short in the wire between the ECM/PCM (E22) and the No. 7 HORN, STOP (15A) fuse. Replace the No. 7 HORN, STOP (15A) fuse.

Idle Speed Inspection11-148

NOTE:

  • Leave the Idle Air Control (IAC) valve connected.
  • Before checking the idle speed, check these items:
  • The Malfunction Indicator Lamp (MIL) has not been reported on.
  • Ignition timing
  • Spark plugs
  • Air cleaner
  • PCV system
    1. Disconnect the Evaporative Emission (EVAP) canister purge valve 2P connector.
    2. Connect a tachometer (A) to the test tachometer connector (B).


    3. Start the engine. Hold the engine at 3,000 rpm (min-1) with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
    4. Check the idle speed with no-load conditions: headlights, blower fan, rear defogger, radiator fan, and air conditioner are not operating.

      Idle speed should be:

      M/T 650 ± 50 rpm (min-1)
      A/T 650 ± 50 rpm (min-1) (in Park or neutral)




    5. Idle the engine for 1 minute with heater fan switch on HI and air conditioner on, then check the idle speed.

      Idle speed should be:

      M/T 700 ± 50 rpm (min-1)
      A/T 700 ± 50 rpm (min-1) (in Park or neutral)




    6. NOTE: If the idle speed is not within specification,
      go to the Symptom Troubleshooting Index.
    7. Reconnect the EVAP canister purge valve 2P connector.
    8. NOTE: You can use the scan tool or Honda PGM Tester to inspect idle speed.

    Honda 2001 Fuel and Emissions11-1
    Idle Control System11-139     		Previous Page Next Page