TROUBLE CODE DIAGNOSTICS - 7.4L MPI
SERVICE MANUAL NUMBER 23
Code 22 (2 of 2): Throttle Position (TP) Sensor Circuit (Non-Scan) Signal
Voltage Low
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 mode.
2.
3.
Ignition “OFF.”
Disconnect throttle sensor harness connec-
tor.
4.
nal “A” (CKT 416) to harness terminal “C”
(CKT 417).
Connect a jumper wire form harness termi-
5.
Marine Diagnostic Code Tool indicates a
stored trouble code.
Start engine and idle for 2 minutes or until
6.
Ignition “ON,” engine “OFF.”
7.
Switch Marine Diagnostic Code Tool to “Ser-
vice Mode” and note trouble code.
Is trouble code 21 present?
–
Step 4
Step 5
Step 3
1.
Remove jumper wire from CKT 416 and
3
CKT 417.
2.
(CKT 416) to harness terminal “B” (CKT 813).
Connect DVOM from harness terminal “A”
Is voltage reading above the specified val-
ue?
4
Volts
–
Step 6
–
Locate and repair intermittent faulty connec-
tions. If OK, replace faulty throttle position sen-
sor. Is action complete?
Verify
Repair
4
5
Locate and repair open or short to ground in
CKT 417. If a problem is found, repair as nec-
essary. Was a problem found?
Verify
Repair
–
Step 7
Locate and repair open or short to ground in
CKT 416. Also check CKT 416E to the MAP
sensor for a short to ground. If a problem is
found, repair as necessary. Was a problem
found?
6
7
–
–
Step 7
–
Verify
Repair
Repair faulty ECM connections or replace
faulty ECM. Is action complete?
Page 5G-12
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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