Hummer H1 Service Manual page 1111

46 PCM/Tech 1 Scan Tool
DTC P0216 - Injection Timing Control System
Step
1 Important: Before clearing DTC(s) use the scan tool "Capture Info"
Was the "On-Board Diagnostic (OBD) System Check" performed?
2 1. Engine at operating temperature.
2. Scan injection timing at idle and at 1500 rpm.
Difference between Actual Inj. Time and Desired at idle or 1500 rpms?
3 DTC is intermittent. An additional DTCs are stored.
4 1. Ignition "OFF".
2. Disconnect PCM.
3. Measure resistance between coil 1 low and coil 1 high at PCM harness.
Is resistance between specified value?
5 Measure resistance between coil 2 low and coil 2 high at PCM harness.
Is resistance between specified value?
6 1. Reconnect PCM.
2. Disconnect Injection Timing Stepper motor.
3. Start and idle engine.
4. Using scan tool, command Time Set "ON".
5. Check for varying voltage on all terminals at injection timing stepper
motor electrical harness. Does voltage vary?
7 1. Disconnect crankshaft position sensor.
2. Measure resistance between crankshaft position sensor signal and 5 volt
reference circuit at sensor pigtail. Is resistance between specified value?
8 Check for inj. timing set correctly and/or sheared camshaft driven key
Was a repair performed?
9 1. Ignition "OFF".
2. Disconnect PCM, check for open in the coil 1 low and high circuit
3. If a problem is found, repair it as necessary. Was a repair required?
10 1. Ignition "OFF".
2. Disconnect PCM, check for open in coil 2 low and high circuit
3. If a problem is found, repair it as necessary. Was a repair required?
11 Check for poor electrical connection at the injection timing stepper motor.
Was a repair performed?
12 Check the circuit for a short to ground or a poor connection at the PCM.
Was a repair performed?
13 Check crankshaft sensor pigtail for a short to ground. Repair it as neces-
sary. Was the circuit shorted to ground?
14 Check the circuit for a poor connection and replace terminal if necessary.
Did Terminal require replacement?
15 Replace crankshaft position sensor.
Is action complete?
16 Replace injection pump. Is action complete?
17 Replace the faulty PCM.
Is the action complete?
_____________________________________________________
Action Value(s) Yes
— Go to Step 2.
5° Go to Step 3. Go to Step 4.
— Go to the
DTC table
10-60 Go to Step 5.
Ohms
10-60 Go to Step 6. Go to Step 10.
Ohms
— Go to Step 7. Go to Step 12.
950-1050 Go to Step 8. Go to Step 15.
Ohms
— Go to Step
18.
— Go to Step
18.
— Go to Step
18.
— Go to Step
12.
— Go to Step
18.
— Go to Step
18.
— Go to Step
18.
— Go to Step
18.
— Go to Step
18.
— Go to Step
18.
®
No
Go to OBD
System Check.
Go to Diag-
nostic Aids
Go to Step 9.
Go to Step 16.
Go to Step 16.
Go to Step 16.
Go to Step 17.
Go to Step 17.
Go to Step 14.
Go to Step 17.
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