K20Z1 Engine
K20Z1 Engine1. Turn the ignition switch ON (II).
Does the charging system indicator come on?
YES - Go to step 2.
NO - Go to step 11.
2. Shift to Park or Neutral, and start the engine. Hold the engine speed at 2,000 rpm for 1 minute.
Does the charging system indicator go off?
YES - Charging system indicator circuit is OK. Go to the Alternator and Regulator Circuit Test.
NO - Go to step 3.
3. Do the gauge control module self-diagnostic function procedure.
Does the charging system indicator flash?
YES - Go to step 4.
NO - Replace the gauge control module.
4. Turn the ignition switch OFF.
5. Disconnect the engine wire harness 6P connector from the starter subharness 6P connector.
6. Turn the ignition switch ON (II).
Does the charging system indicator go off?
YES - Replace or repair the alternator.
NO - Go to step 7.
7. Turn the ignition switch OFF.
8. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC). Turn the ignition switch ON (II), and jump the SCS line with the HDS, then turn the ignition switch OFF.
NOTE: This step must be done to protect the engine control module (ECM) from damage.
9. Disconnect ECM connector B (24P).
10. Check for continuity between ECM connector terminal B10 and body ground.
Is there continuity?
YES - Repair a short in the wire between the alternator and the ECM.
NO - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.
11. Do the gauge control module self-diagnostic function procedure.
Does the charging system indicator flash?
YES - Go to step 12.
NO - Replace the gauge control module.
12. Turn the ignition switch OFF.
13. Disconnect the engine wire harness 6P connector from the starter subharness 6P connector.
14. Connect engine wire harness 6P connector terminal No. 6 and body ground with a jumper wire.
15. Turn the ignition switch ON (II).
Does the charging system indicator come on?
YES - Replace the alternator or repair the alternator.
NO - Go to step 16.
16. Connect the HDS to the DLC. Turn the ignition switch ON (II), and jump the SCS line with the HDS, then turn the ignition switch OFF.
NOTE: This step must be done to protect the ECM from damage.
17. Disconnect ECM connector B (24P).
18. Check for continuity between ECM connector terminal B10 and body ground.
Is there continuity?
YES - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.
NO - Repair an open in the wire between the alternator and the ECM.