TROUBLE CODE DIAGNOSTICS - 7.4L MPI
SERVICE MANUAL NUMBER 23
Code 21 (1 of 2): Throttle Position (TP) Sensor Circuit (Non-Scan) Signal
Voltage High
STEP
ACTION
VALUE
YES
NO
PROCEED TO
Go to
Was the “On-Board Diagnostic” (OBD) System
Check Performed?
OBD
System
Check
1
2
–
Step 2
1.
Marine Diagnostic Code Tool switched to the
normal or “OFF” Mode.
2.
3.
Ignition “OFF.”
Disconnect throttle position sensor harness
connector.
4.
Marine Diagnostic Code Tool indicates a
stored trouble code.
Start engine and idle for 2 minutes or until
5.
Ignition “ON”, engine “OFF.”
6.
vice Mode” and note the trouble code.
Switch Marine Diagnostic Code Tool to “Ser-
Is the trouble code 22 present?
–
Step 4
Step 6
Step 3
3
1. TP sensor harness connector disconnected.
2.
Ignition “ON,” engine “OFF.”
3.
Connect DVOM from harness terminal “B”
(CKT 813) to harness terminal “A” (CKT 416).
4
Volts
–
Step 5
–
Is voltage reading above specified value?
Locate and repair intermittent faulty connec-
tions. If OK, replace faulty TP sensor. Is action
complete?
4
5
Locate and repair open in CKT 813. If a prob-
lem is found, repair as necessary. Was a prob-
lem found?
–
Step 7
Verify
Repair
Locate and repair short to voltage in CKT 417.
If a problem is found, repair as necessary. Was
a problem found?
6
7
–
–
Step 7
–
Repair faulty ECM connection or replace faulty
ECM. Is action complete?
Page 5G-10
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 |
(1 votes, average: 5 out of 5)
Marine readers have rated Mercury MerCruiser GM V8 GM V8 454 CID 7.4L and 502 cid 8.2L Marine Engines Service Manual Number 23 5.0 out of 5.0 based on 1 product reviews. Just need the manual. Wrote review. Can't technically review what I haven't seen yet...