TROUBLE CODE DIAGNOSTICS - 454/502 MAG MPI & 8.2L MPI
SERVICE MANUAL NUMBER 23
Code 42 (3 of 3): Ignition Control (IC) Circuit (Non-Scan) (Continued)
1.
2.
3.
4.
Ignition OFF.
Disconnect ECM J1 and J2 connectors.
Ignition ON.
Use DVOM with selector in the OHMS
3
–
Step 4
Step 5
range.
5.
Probe ECM harness connector CKT 423
with DVOM to ground.
It should read more than 3000 Ohms. Does it?
Probe ECM harness connector CKT 424 with a
test light connected to battery positive (B+).
4
5
–
–
Step 13 Step 6
Is test light on?
Open CKT 423, faulty connection or faulty igni-
tion module.
–
–
With Ohmmeter connected to ECM harness
CKT 423 and ground (–), probe harness CKT
424
with test light connected to battery positive
(B+).
6
7
–
–
Step 8
Step 7
As test light contacts CKT 424, resistance
should change from over 3000 Ohms to under
1000
Ohms. Does it?
Disconnect distributor 4-way connector. Con-
nect Ohmmeter between CKT 423 and ground
(–).
Step 9 Step 10
Step 11 Step 12
Resistance should have gone high (open cir-
cuit). Does it?
Reconnect ECM and idle engine for 1 minute
or until code 42 sets. Does Code 42 Set?
8
9
–
–
CKT 424 open, faulty connections, or faulty
ignition module.
–
–
10
11
CKT 423 shorted to ground.
Faulty ECM.
–
–
–
–
–
–
Code 42 is intermittent. Refer to “Diagnostic
Aids.”
12
–
–
–
–
Disconnect ignition module 4-way connector.
Is test light on?
13
Step 14 Step 15
14
15
CKT 424 shorted to ground.
Faulty ignition module.
–
–
–
–
–
–
Index
Page 5F-16
90-861326--1 MARCH 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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