Pgm-Fi System: Diagnosis Honda S2000 AP1

DTC Troubleshooting

DTC INDEX

DLC Circuit Troubleshooting

If the ECM does not communicate with a scan tool, the HDS, or I/M test equipment, do this troubleshooting procedure.

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Scheme 9

1. Measure voltage between DLC terminal No. 16 and body ground. Is there battery voltage? YES - Go to step 2. NO - Repair open in the wire between DLC terminal No. 8 and the ACGS (15 A) fuse in the under-hood fuse/relay box.
2. Measure voltage between DLC terminals No. 4 and No. 16. Is there battery voltage? YES - Go to step 3. NO - Repair open in the wire between DLC terminal No. 8 and body ground (G401).
3. Measure voltage between DLC terminals No. 5 and No. 16. Is there battery voltage? YES - Go to step 4. NO - Repair open in the wire between DLC terminal No. 8 and body ground (G101).
4. Turn the ignition switch ON (II).
5. Measure voltage between DLC terminals No. 5 and No. 7. Is there 8.5 V or more? YES - Go to step 10 . NO - Go to step 6.
6. Turn the ignition switch OFF.
7. Disconnect ECM connector A (32P). Make sure the scan tool or the HDS is disconnected from the DLC.
8. Check for continuity between DLC terminal No. 7 and body ground. Is there continuity? YES - Repair short to ground in the wire between DLC terminal No. 15 and the ECM (A21). After repairing the wire, check for DTCs with a scan tool or the HDS, and go to the indicated DTC's troubleshooting . NO - Go to step 9.
9. Check for continuity between DLC terminal No. 15 and ECM terminal A21. Is there continuity? YES - Substitute a known-good ECM (see «HOW TO SUBSTITUTE THE ECM FOR TESTING PURPOSES»(ref-221328-S04997151962006022400000) ) and recheck. If the symptom/indication goes away, replace the original ECM (see «ECM REPLACEMENT»(ref-221329-S30667517252006022400000) ). NO - Repair open in the wire between DLC terminal No. 7 and the ECM (A21). After repairing the wire, check for DTCs with a scan tool or the HDS, and go to the indicated DTC's troubleshooting.
10. Turn the ignition switch OFF.
11. Disconnect ECM connector A (32P). Make sure a scan tool or the HDS is disconnected from the DLC.
12. Turn the ignition switch ON (II).
13. Measure voltage between DLC terminals No. 5 and No. 7. Is there 0 V? YES - Substitute a known-good ECM (see «HOW TO SUBSTITUTE THE ECM FOR TESTING PURPOSES»(ref-221328-S04997151962006022400000) ) and recheck. If the symptom/indication goes away, replace the original ECM (see «ECM REPLACEMENT»(ref-221329-S30667517252006022400000) ). NO - Repair short to power in the wire between the DLC terminal No. 7 and the ECM (A21). After repairing the wire, check for DTCs with a scan tool or the HDS, and go to the indicated DTC's troubleshooting.

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1. Relieve the fuel pressure (see «FUEL PRESSURE RELIEVING»(ref-221332-S01007787392006022400000) ).
2. Remove the fuel rail cover (A), then disconnect the connectors from the injectors (B).
3. Disconnect the vacuum hose and fuel return hose from the fuel pressure regulator (C). Place a rag or shop towel over the hoses before disconnecting them.
4. Disconnect the fuel hose (D) from the fuel rail (E). Remove the vacuum lines (F).
5. Remove the retainer nuts (G) and bolts (H) from the fuel rail and harness holder (I).
6. Disconnect the PCV valve (J).
7. Disconnect the fuel rail.
8. Remove the injectors from the intake manifold (K).
9. Slide new cushion rings (A) onto the injectors (B).
10. Coat new O-rings (C) with clean engine oil, and put them on the injectors.
11. Insert the injectors into the fuel rail (D).
12. Coat new seal rings (E) with clean engine oil, and press them into the intake manifold.
13. Install the injectors in the intake manifold.
14. Install and tighten the retainer nuts.
15. Connect the fuel hose to the fuel rail with new washers.
16. Connect the vacuum hoses and fuel return hose to the fuel pressure regulator.
17. Connect the PCV valve.
18. Turn the ignition switch ON (II), but do not operate the starter. After the fuel pump runs for about 2 seconds, the fuel pressure in the fuel line rises. Repeat this 2 or 3 times, then check for fuel leakage.

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1. Disconnect primary HO2S (Sensor 1) 4P connector (A).
2. Remove the primary HO2S (Sensor 1) (B).
3. Install the primary HO2S (Sensor 1) in the reverse order of removal.

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1. Disconnect secondary HO2S (Sensor 2) 4P connector (A).
2. Remove the secondary HO2S (Sensor 2) (B).
3. Install the secondary HO2S (Sensor 2) in the reverse order of removal.

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1. Turn the ignition switch OFF.
2. Disconnect the negative cable from the battery.
3. Remove the left side kick panel (A) to expose the ECM (B).
4. Remove the two bolts from the ECM.
5. Disconnect the ECM connectors.
6. Install the ECM in the reverse order of removal.
7. Connect the HDS to the DLC (A) located under the passenger's side of dashboard (2000-2001 models) or behind the driver's side of the front console (2002-2005 models).
8. Turn the ignition switch ON (II). NOTE: If DTC P0630 "VIN Not Programmed or Mismatch" is stored at this time, ignore it and continue this procedure (2004-2005 models).
9. Input the VIN to the ECM with the HDS.
10. Rewrite the immobilizer code with the ECM replacement procedure in the HDS; it allows you to start the engine.
11. Reset the ECM with the HDS.
12. Do the ECM idle learn procedure (see «IDLE SPEED INSPECTION»(ref-221331-S09851216702006022400000) ).