Idle Control System: Other Honda Odyssey II

'99-00, '02-04 Models

Note. Information marked with an asterisk (*) applies to '02-04 models.

Scheme 351

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1. Turn the ignition switch OFF.
2. Disconnect the A/C pressure switch 4P connector.
3. Turn the ignition switch ON (II).
4. Measure voltage between PCM connector terminals A27 and B20. Is there about 5 V? YES: Go to step 5. NO: Go to step 12 .
5. Turn the ignition switch OFF.
6. Reconnect the A/C pressure switch 4P connector.
7. Turn the ignition switch ON (II).
8. Momentarily connect PCM connector terminals A17 and B20 with a jumper wire several times. Is there a clicking noise from the A/C compressor clutch? YES: Go to step 9. NO: Go to step 15 .
9. Start the engine.
10. Turn the blower switch ON.
11. Turn the A/C switch ON. Does the A/C operate? YES: The air conditioning signal is OK. NO: Go to step 16 .
12. Turn the ignition switch OFF.
13. Disconnect PCM connector A (32P).
14. Check for continuity between body ground and PCM connector terminal A27. Is there continuity? YES: Repair short in the wire between the PCM (A27) and the A/C pressure switch. NO: Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING PURPOSE»(ref-171136-S22224174352005011100000) ). If the prescribed voltage is now available, replace the original PCM. If not, check the A/C system for other symptoms.
15. Momentarily connect under-hood fuse/relay box 16P connector terminal No. 11 to body ground with a jumper wire several times. NOTE: The under-hood fuse/relay box 16P connector is on the bottom of the fuse box. When you unbolt and invert the fuse box, leave the upper cover on to prevent short circuits. Is there a clicking noise from the A/C compressor clutch? YES: Repair open in the wire between the PCM (A17) and the A/C clutch relay. NO: Check the A/C system for other symptoms.
16. Measure voltage between PCM connector terminals A27 and B20. Is there less than 1.0 V? YES: Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING PURPOSE»(ref-171136-S22224174352005011100000) ). If the symptom/indication goes away, replace the original PCM. If not, check the A/C system for other symptoms. NO: Repair open in the wire between the PCM (A27) and the A/C pressure switch.

Scheme 356

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Scheme 360

1. Turn the ignition switch OFF.
2. Disconnect the A/C pressure switch 4P connector.
3. Turn the ignition switch ON (II).
4. Measure voltage between PCM connector terminals A26 and E21. Is there about 5 V? YES: Go to step 5. NO: Go to step 12 .
5. Turn the ignition switch OFF.
6. Reconnect the A/C pressure switch 4P connector.
7. Turn the ignition switch ON (II).
8. Momentarily connect PCM connector terminals A26 and E12 with a jumper wire several times. Is there a clicking noise from the A/C compressor clutch? YES: Go to step 9. NO: Go to step 15 .
9. Start the engine.
10. Turn the blower switch ON.
11. Turn the A/C switch ON. Does the A/C operate? YES: The air conditioning signal is OK. NO: Go to step 16 .
12. Turn the ignition switch OFF.
13. Disconnect PCM connector E (31P).
14. Check for continuity between body ground and PCM connector terminal E21. Is there continuity? YES: Repair short in the wire between the PCM (E21) and the A/C pressure switch. NO: Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING PURPOSE»(ref-171136-S22224174352005011100000) ) If the prescribed voltage is now available, replace the original PCM If not, check the A/C system for other symptoms.
15. Momentarily connect under-hood fuse/relay box 16P connector terminal No. 11 to body ground with a jumper wire several times. NOTE: The under-hood fuse/relay box 16P connector is on the bottom of the fuse box. When you unbolt and invert the fuse box, leave the upper cover on to prevent short circuits. Is there a clicking noise from the A/C compressor clutch? YES: Repair open in the wire between the PCM (E12) and the A/C clutch relay. NO: Check the A/C system for other symptoms.
16. Measure voltage between PCM connector terminals A26 and E21. Is there less than 10 V? YES: Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING PURPOSE»(ref-171136-S22224174352005011100000) ). If the symptom/indication goes away, replace the original PCM. If not, check the A/C system for other symptoms. NO: Repair open in the wire between the PCM (E21) and the A/C pressure switch.

Note. Information marked with an asterisk (*) applies to '02-04 models.

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1. Disconnect the alternator 4P connector.
2. Turn the ignition switch ON (II).
3. Measure voltage between PCM connector terminals B20 and C5. Is there about 5 V? YES: Go to step 4. NO: Go to step 13 .
4. Turn the ignition switch OFF.
5. Reconnect the alternator 4P connector.
6. Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
7. Measure voltage between PCM connector terminals B20 and C5. 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.
8. Turn the ignition switch OFF.
9. Disconnect PCM connector C (31P).
10. Disconnect the alternator 4P connector.
11. Connect alternator 4P connector terminal No 4 to body ground with a jumper wire.
12. Check for continuity between body ground and PCM connector terminal C5. Is there continuity? YES: Test the alternator (see step 1 on Alternator Control System Test ). NO: Repair open in the wire between the PCM (C5) and the alternator.
13. Turn the ignition switch OFF.
14. Disconnect PCM connector C (31P).
15. Check for continuity between body ground and PCM connector terminal C5. Is there continuity? YES: Repair short in the wire between the PCM (C5) and the alternator. NO: Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING PURPOSE»(ref-171136-S22224174352005011100000) ). If the prescribed voltage is now available, replace the original PCM.

Scheme 365

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Scheme 368

1. Disconnect the alternator 4P connector.
2. Turn the ignition switch ON (II).
3. Measure voltage between PCM connector terminals A19 and A26. Is there about 5 V? YES: Go to step 4. NO: Go to step 13 .
4. Turn the ignition switch OFF.
5. Reconnect the alternator 4P connector.
6. Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
7. Measure voltage between PCM connector terminals A19 and A26. 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.
8. Turn the ignition switch OFF.
9. Disconnect PCM connector A (31P).
10. Disconnect the alternator 4P connector.
11. Connect alternator 4P connector terminal No. 4 to body ground with a jumper wire.
12. Check for continuity between body ground and PCM connector terminal A19. Is there continuity? YES: Test the alternator (see step 1 on Alternator Control System Test ). NO: Repair open in the wire between the PCM (A19) and the alternator.
13. Turn the ignition switch OFF.
14. Disconnect PCM connector A (31P).
15. Check for continuity between body ground and PCM connector terminal A19. Is there continuity? YES: Repair short in the wire between the PCM (A19) and the alternator. NO: Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING PURPOSE»(ref-171136-S22224174352005011100000) ). If the prescribed voltage is now available, replace the original PCM.

Note. Information marked with an asterisk (*) applies to '02-04 models.

Scheme 369

1. Shift the transmission in P or N.
2. Measure voltage between PCM connector terminals A24 and B20 with the ignition switch in the START position (III). Is there battery voltage? YES: The starter switch signal is OK. NO: Go to step 3.
3. Inspect the No. 13 STARTER SIGNAL (7.5A) fuse in the driver's under-dash fuse/relay box. Is the fuse OK? YES: Repair open in the wire between the PCM (A24) and the No. 13 STARTER SIGNAL (7.5A) fuse. NO: Repair short in the wire between the PCM (A24) and the No. 13 STARTER SIGNAL (7.5A) fuse or the PGM-FI main relay. Replace the No. 13 STARTER SIGNAL (7.5A) fuse.

Scheme 370

1. Shift the transmission in P or N position.
2. Measure voltage between PCM connector terminals A26 and E8 with the ignition switch in the START position (III). Is there battery voltage? YES: The starter switch signal is OK. NO: Go to step 3.
3. Inspect the No. 13 STARTER SIGNAL (7.5A) fuse in the driver's under-dash fuse/relay box. Is the fuse OK? YES: Repair open in the wire between the PCM (E8) and the No. 13 STARTER SIGNAL (7.5A) fuse. NO: Repair short in the wire between the PCM (E8) and the No. 13 STARTER SIGNAL (7.5A) fuse or the PGM-FI main relay. Replace the No. 13 STARTER SIGNAL (7.5A) fuse.

Note. Information marked with an asterisk (*) applies to '02-04 models.

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1. Turn the ignition switch ON (II).
2. Measure voltage between PCM connector terminals A26 and B20. Is there less than 1.0 V? YES: Go to step 3. NO: Go to step 6 .
3. Start the engine.
4. Turn the steering wheel to the full lock position.
5. Measure voltage between PCM connector terminals A26 and B20. Is there battery voltage? YES: The PSP switch signal is OK. NO: Go to step 13 .
6. Turn the ignition switch OFF.
7. Disconnect the PSP switch 2P connector.
8. Turn the ignition switch ON (II).
9. At the harness side, connect PSP switch 2P connector terminals No. 1 and No. 2 with a jumper wire.
10. Measure voltage between PCM connector terminals A26 and B20. Is there less than 1.0 V? YES: Replace the PSP switch. NO: Go to step 11.
11. Turn the ignition switch OFF.
12. Check for continuity between PSP switch 2P connector No. 2 terminal and body ground. Is there continuity? YES: Repair open in the wire between the PSP switch and PCM (A26). NO: Repair open in the wire between the PSP switch and G201.
13. Turn the ignition switch OFF.
14. Disconnect the PSP switch 2P connector.
15. Turn the ignition switch ON (II).
16. Measure voltage between PCM connector terminals A26 and B20. Is there battery voltage? YES: Replace the PSP switch. NO: Go to step 17.
17. Turn the ignition switch OFF.
18. Disconnect PCM connector A (32P).
19. Check for continuity between body ground and PCM connector terminal A26. Is there continuity? YES: Repair short in the wire between the PCM (A26) and the PSP switch. NO: Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING PURPOSE»(ref-171136-S22224174352005011100000) ). If voltage is normal, replace the original PCM.

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Scheme 380

1. Turn the ignition switch ON (II).
2. Measure voltage between PCM connector terminals A26 and E20. Is there less than 1.0 V? YES: Go to step 3. NO: Go to step 6 .
3. Start the engine.
4. Turn the steering wheel to the full lock position.
5. Measure voltage between PCM connector terminals A26 and E20. Is there battery voltage? YES: The PSP switch signal is OK. NO: Go to step 13 .
6. Turn the ignition switch OFF.
7. Disconnect the PSP switch 2P connector.
8. Turn the ignition switch ON (II).
9. At the harness side, connect PSP switch 2P connector terminals No. 1 and No. 2 with a jumper wire.
10. Measure voltage between PCM connector terminals A26 and E20. Is there less than 1.0 V? YES: Replace the PSP switch. NO: Go to step 11.
11. Turn the ignition switch OFF.
12. Check for continuity between PSP switch 2P connector No. 2 terminal and body ground. Is there continuity? YES: Repair open in the wire between the PSP switch and PCM (E20). NO: Repair open in the wire between the PSP switch and G201.
13. Turn the ignition switch OFF.
14. Disconnect the PSP switch 2P connector.
15. Turn the ignition switch ON (II).
16. Measure voltage between PCM connector terminals A26 and E20. Is there battery voltage? YES: Replace the PSP switch. NO: Go to step 17.
17. Turn the ignition switch OFF.
18. Disconnect PCM connector E (31P).
19. Check for continuity between body ground and PCM connector terminal E20. Is there continuity? YES: Repair short in the wire between the PCM (E20) and the PSP switch. NO: Substitute a known-good PCM and recheck (see «HOW TO SUBSTITUTE THE PCM FOR TESTING PURPOSE»(ref-171136-S22224174352005011100000) ). If voltage is normal, replace the original PCM.

Note. Information marked with an asterisk (*) applies to '02-04 models.

Scheme 381

1. Check the brake lights. Are the brake lights on without pressing the brake pedal? YES: Inspect the brake switch (see Brake Pedal Height Check and Brake Pedal Position Switch Adjustment ). NO: Go to step 2.
2. Press the brake pedal. Do the brake lights come on? YES: Go to step 3. NO: Go to step 4 .
3. Measure voltage between PCM connector terminals A32 and B20 with the brake pedal pressed. Is there battery voltage? YES: The brake pedal position switch signal is OK. NO: Repair open in the wire between the PCM (A32) and the brake pedal position switch.
4. Inspect the STOP (20A) 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 STOP (20A) fuse. Inspect the brake pedal position switch (see Brake Pedal Height Check and Brake Pedal Position Switch Adjustment ). NO: Repair short in the wire between the PCM (A32) and the STOP (20A) fuse. Replace the STOP (20A) fuse.

Scheme 382

1. Check the brake lights. Are the brake lights on without pressing the brake pedal? YES: Inspect the brake pedal position switch (see Brake Pedal Height Check and Brake Pedal Position Switch Adjustment ). NO: Go to step 2.
2. Press the brake pedal. Do the brake lights come on? YES: Go to step 3. NO: Go to step 4 .
3. Measure voltage between PCM connector terminals A26 and E9 with the brake pedal pressed. Is there battery voltage? YES: The brake pedal position switch signal is OK. NO: Repair open in the wire between the PCM (E9) and the brake pedal position switch.
4. Inspect the STOP (20A) 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 STOP (20A) fuse. Inspect the brake pedal position switch (see Brake Pedal Height Check and Brake Pedal Position Switch Adjustment ). NO: Repair short in the wire between the PCM (E9) and the STOP (20A) fuse.

PCM Idle Learn Procedure

For the PCM to learn the engine idle characteristics, this procedure must be done.

Do the idle learn procedure whenever you do any of these actions

1. Disconnect the battery.
2. Replace the PCM.
3. Replace or clean the throttle body.
4. Replace the idle air control (IAC) valve.
5. Reset the PCM. NOTE: Clearing DTCs with the HDS does not require you to do the idle learn procedure.
6. Remove the No. 13 CLOCK BACK UP (7.5A) fuse from the passenger's under-dash fuse/relay box.
7. Remove the BATTERY (120A) fuse from the under-hood fuse/relay box.
8. Remove the BACK UP, ACC (40A) fuse from the under-hood fuse/relay box.
9. Remove any of the wires from the under-hood fuse/relay box.
10. Remove any of the wires from the driver's/passenger's under-dash fuse/relay box.
11. Disconnect any of the connectors from the under-hood fuse/relay box.
12. Disconnect any of the connectors from the driver's/passenger's under-dash fuse/relay box.
13. Disconnect the connector between the engine wire harness and left engine compartment wire harness.
14. Disconnect the G2 terminal from the transmission housing.
15. Disconnect the G1 terminal from the body.
16. Disconnect the G101 terminal from the water passage.
17. Disconnect the G102 terminal from the intake manifold.

Procedure

1. Make sure all electrical items (A/C, audio, rear window defogger, lights, etc.,) are off.
2. Start the engine, and hold it at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, or until the engine coolant temperature reaches 194°F (90°C).
3. Let the engine idle for a minimum of 5 minutes with no load. NOTE: If the radiator fan cycles during this time, do not include its running time in the 5 minutes.