PleasureCraft Engine Group 5.0L, Diagnostic Manual

Page: 249 / 337

5.0/5.7/6.0/8.1L Diagnosis 5 - 107
MEFI 4 - PCM
DTC 41 (EST G Fault) - Ignition Coil 4 Control Circuit (6.0/8.1L)
Step Action Value Yes No
1
Was the “On-Board Diagnostic” (OBD) system check Go to OBD
performed? — Go to Step 2 System Check
Important: If all the Ignition Control (IC) DTCs are set at
the same time, inspect the IC ground circuits for an open.
1. Install a scan tool.
2
2. Using a scan tool, clear DTCs.
3. Start and idle the engine for 2 minutes.
4. Check for DTCs. Go to
Does the scan tool indicate a DTC 41 for ignition coil 4? — Go to Step 3 Diagnostic Aids
1. Turn OFF the engine.
2. Disconnect the ignition coil electrical harness.
3
3. Measure the frequency at the ignition control signal
circuit using the DMM J 39200 on the DC Hertz scale.
Is the frequency within the specifi ed range? 3.0-20 Hz Go to Step 7 Go to Step 4
Measure the voltage at the ignition control signal circuit
4
using the DMM J 39200.
Is the voltage greater that the specifi ed value? 1.0 volts Go to Step 8 Go to Step 5
1. Turn OFF the engine.
2. Disconnect the ECM connector J2.
5
3. Test the continuity from the IC circuit (at the ignition
coil harness connector) to the ECM connector using
the DMM J 39200.
Does the DMM indicate continuity? — Go to Step 6 Go to Step 9
Test the resistance from the IC circuit (at the ignition coil
6
harness connector) to ground using the DMM J 39200.
Does the DMM indicate OL (out-of-limits)? — Go to Step 10 Go to Step 9
7
Replace the ignition coil.
Is the action complete? — Go to Step 12 —
8
Repair the Ignition Control circuit for a short to voltage.
Is the action complete? — Go to Step 12 —
Repair the Ignition Control circuit for an open or grounded
9
circuit.
Is the action complete? — Go to Step 12 —
1. Inspect for poor connections at the ECM connector.
10
2. Replace the terminal if necessary.
Did you fi nd and correct the problem? — Go to Step 12 Go to Step 11
11
Replace the ECM.
Is the action complete? — Go to Step 12 —
1. Select the Diagnostic Trouble Code (DTC) option and
12
the Clear DTC information option using the scan tool.
2. Idle the engine at the normal operating temperature.
Is DTC 41 indicated? — Go to Step 2 Go to Step 13
Select the Diagnostic Trouble Code (DTC) option. Go to the
13
Does the scan tool display any DTCs that you have not applicable
diagnosed? — DTC table System OK