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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Control System & Fuel System - 4.8L, 5.3L, And 6.0L - Troubleshooting & Diagnosis) >> Electronic Ignition (EI) System Diagnosis >> Test Description

Test Description

WARNING: This page is about a different variant/trim than selected.

The number below refers to the step number on the diagnostic table.

  1. 4:  Monitoring the misfire current counters determines if a fault is present.
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
  1. Crank the engine.
  2. Observe the engine speed parameter with a scan tool.
Does the scan tool display engine RPM?		 - Go to Step 3  Go to Step 15 
3 Is DTC P0335, P0336, P0351, or P0358 also set? - Go to Diagnostic Trouble Code (DTC) List - Vehicle Go to Step 4 
4 
  1. Idle the engine.
  2. Observe the misfire current counters on the scan tool.
Does the scan tool display any misfire current counters incrementing?		 - Go to Step 5  Go to Diagnostic Aids
5 Do the misfire current counters increment for most cylinders on one bank of the engine? - Go to Step 11  Go to Step 6 
6
  1. Inspect the spark plug wire for open circuits, cracks, or improper seating of terminals at the spark plug or coil before proceeding with the test. Refer to Spark Plug Wire Inspection .
  2. Inspect for spark at the plug with the J 26792  Spark Tester or equivalent while cranking. A few sparks, then nothing is considered no spark.
Is adequate spark present?		 - Go to Step 32  Go to Step 7 
7 Measure the spark plug wire resistance. Refer to Spark Plug Wire Inspection .
Is the resistance more than the specified value?		 397-1,337 Ω/ft Go to Step 31  Go to Step 8 
8
  1. Turn OFF the ignition.
  2. Disconnect the ignition coil that corresponds to the Misfire Current counter that was incrementing.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the ignition 1 voltage circuit of the ignition coil with a test lamp connected to a good ground. Refer to Probing Electrical Connectors .
Does the test lamp illuminate?		 - Go to Step 9  Go to Step 12 
9 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 10  Go to Step 13 
10 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 19  Go to Step 14 
11 Inspect for an open ENG 1 or ENG 2 fuse.
Is the fuse open?		 - Go to Step 28  Go to Step 22 
12
  1. Disconnect the main ignition coil 8-way connector.
  2. Probe the ignition 1 voltage circuit at the ignition coil main 8-way connector using the test lamp connected to battery ground. Refer to Probing Electrical Connectors .
Does the test lamp illuminate?		 - Go to Step 23  Go to Step 22 
13
  1. Disconnect the main ignition coil 8-way connector.
  2. Probe the ignition 1 voltage circuit on the harness side 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 17  Go to Step 25 
14
  1. Disconnect the main ignition coil 8-way connector.
  2. Probe the ignition 1 voltage circuit on the harness side 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 18  Go to Step 27 
15
  1. Turn ON the ignition, with the engine OFF.
  2. Disconnect the crankshaft position (CKP) sensor.
  3. Measure the voltage from the CKP sensor 12-volt reference circuit and a good ground with the DMM.
  4. Observe the ignition 1 voltage parameter with a scan tool.
Is the difference in the voltage more than the specified value?		 0.5 V Go to Step 16  Go to Step 29 
16 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 34  Go to Step 21 
17 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 34  Go to Step 24 
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 34  Go to Step 26 
19 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 34  Go to Step 30 
20 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 34  Go to Step 29 
21 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 34  Go to Step 33 
22 Repair the open 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 34  -
23 Repair the open 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 34  -
24 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 34  -
25 Repair the open in the ground circuit. Refer to Wiring Repairs .
Did you complete the repair?		 - Go to Step 34  -
26 Repair the open 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 34  -
27 Repair the open low reference circuit between the PCM and the splice. Refer to Wiring Repairs .
Did you complete the repair?		 - Go to Step 34  -
28
  1. Repair the short to ground in the ignition 1 voltage circuit. Refer to Wiring Repairs .
  2. Replace the fuse.
Did you complete the repair?		 - Go to Step 34  -
29 Replace the CKP sensor. Refer to Crankshaft Position Sensor Replacement .
Did you complete the replacement?		 - Go to Step 34  -
30 Replace the ignition coil. Refer to Ignition Coil Replacement .
Did you complete the replacement?		 - Go to Step 34  -
31 Replace the spark plug wire. Refer to Spark Plug Wire Replacement .
Did you complete the replacement?		 - Go to Step 34  -
32 Replace the spark plug. Refer to Spark Plug Replacement .
Did you complete the replacement?		 - Go to Step 34  -
33 Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 34  -
34 Attempt to start the engine.
Does the engine start and continue to run?		 - Go to Step 35  Go to Step 2 
35
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Allow the engine to reach operating temperature.
Are there any DTCs that have not been diagnosed?		 - System OK Go to Diagnostic Trouble Code (DTC) List - Vehicle
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