Test Description
WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic table.
- 5: Monitoring the misfire current counters determines if a fault is present.
- 12: A good indication that the fuse is open is all of the misfire current counters are incrementing on one side of the engine. Inspect the ignition positive voltage circuit for a grounded circuit. If the fuse is open and the ignition coil circuits are OK, inspect the injector circuits for being grounded.
Electronic Ignition (EI) System Diagnosis
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Connector End Views or Powertrain Control Module Connector End Views |
||||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 | Attempt to start the engine. Does the engine start and run? |
- | Go to Step 5 | Go to Step 3 |
| 3 |
|
- | Go to Step 7 | Go to Step 4 |
| 4 | Is DTC P0335, P0336, or P0351-P0358 also set? | - | Go to Diagnostic Trouble Code (DTC) List - Vehicle | Go to Step 16 |
| 5 |
|
- | Go to Step 6 | Go to Diagnostic Aids |
| 6 | Do the misfire current counters increment for most cylinders on one bank of the engine? | - | Go to Step 12 | Go to Step 7 |
| 7 |
|
- | Go to Step 33 | Go to Step 8 |
| 8 | Measure the spark plug wire resistance. Refer to Spark Plug Wire Inspection
. Is the resistance within the specified value? |
397-1,337 Ω | Go to Step 32 | Go to Step 9 |
| 9 |
|
- | Go to Step 10 | Go to Step 13 |
| 10 | Probe the ignition 1 voltage circuit at the ignition coil with a test lamp connected to the ground circuit of the ignition coil. Refer to Probing Electrical Connectors
. Does the test lamp illuminate? |
- | Go to Step 11 | Go to Step 14 |
| 11 | Probe the ignition 1 voltage circuit at the ignition coil with a test lamp connected to the low reference circuit of the ignition coil. Refer to Probing Electrical Connectors
. Does the test lamp illuminate? |
- | Go to Step 20 | Go to Step 15 |
| 12 | Inspect for an open INJ 1 or INJ 2 fuse. Is the fuse open? |
- | Go to Step 29 | Go to Step 23 |
| 13 |
|
- | Go to Step 24 | Go to Step 23 |
| 14 |
|
- | Go to Step 18 | Go to Step 26 |
| 15 |
|
- | Go to Step 19 | Go to Step 28 |
| 16 |
|
0.5 V | Go to Step 17 | Go to Step 21 |
| 17 | Test for a short to ground in the CKP 12-volt reference circuit or the camshaft position (CMP) sensor 12-volt reference circuit. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 35 | Go to Step 22 |
| 18 | Test for an intermittent and for a poor connection at the ignition coil 8-way connector. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 35 | Go to Step 25 |
| 19 | Test for an intermittent and for a poor connection at the ignition coil 8-way connector. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 35 | Go to Step 27 |
| 20 | Test for an intermittent and for a poor connection at the ignition coil. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 35 | Go to Step 31 |
| 21 | Test for an intermittent and for a poor connection at the CKP sensor. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 35 | Go to Step 30 |
| 22 | Test for an intermittent and for a poor connection at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 35 | Go to Step 34 |
| 23 | Repair the open or high resistance in the ignition 1 voltage circuit between the fuse block and the splice. Refer to Wiring Repairs
. Did you complete the repair? |
- | Go to Step 35 | - |
| 24 | Repair the open or high resistance in the ignition 1 voltage circuit between the splice and the ignition coil connector. Refer to Wiring Repairs
. Did you complete the repair? |
- | Go to Step 35 | - |
| 25 | Repair the open in the ground circuit between the main 8-way connector and the ignition coil. Refer to Wiring Repairs
. Did you complete the repair? |
- | Go to Step 35 | - |
| 26 | Repair the open in the ground circuit. Refer to Wiring Repairs
. Did you complete the repair? |
- | Go to Step 35 | - |
| 27 | Repair the open in the low reference circuit between the main 8-way connector and the ignition coil. Refer to Wiring Repairs
. Did you complete the repair? |
- | Go to Step 35 | - |
| 28 | Repair the open in the low reference circuit between the PCM and the splice. Refer to Wiring Repairs
. Did you complete the repair? |
- | Go to Step 35 | - |
| 29 |
|
- | Go to Step 35 | - |
| 30 | Replace the CKP sensor. Refer to Crankshaft Position Sensor Replacement
. Did you complete the replacement? |
- | Go to Step 35 | - |
| 31 | Replace the ignition coil. Refer to Ignition Coil Replacement
. Did you complete the replacement? |
- | Go to Step 35 | - |
| 32 | Replace the spark plug wire. Refer to Spark Plug Wire Replacement
. Did you complete the replacement? |
- | Go to Step 35 | - |
| 33 | Replace the spark plug. Refer to Spark Plug Replacement
. Did you complete the replacement? |
- | Go to Step 35 | - |
| 34 | Replace the PCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 35 | - |
| 35 | Attempt to start the engine. Does the engine start and continue to run? |
- | Go to Step 36 | Go to Step 3 |
| 36 |
|
- | Go to Diagnostic Trouble Code (DTC) List - Vehicle | System OK |