TROUBLE CODE DIAGNOSTICS - 7.4L MPI
SERVICE MANUAL NUMBER 23
Code 22 (2 of 3): Throttle Position (TP) Sensor Circuit (Scan) Low Signal
Voltage
TEST DESCRIPTION:
Number(s) below refer to step number(s) on the diagnostic table.
Step 2. With the throttle closed, the TP sensor voltage should read 0.3-0.9 volt. If it does
not, check the throttle cable adjustment or for bent or binding linkage.
Step 3. This test simulates a DTC 21. If the ECM recognizes the high signal voltage, the
ECM and wiring are OK.
Step 4. This test checks for the 5 volt reference on CKT 416.
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. Throttle closed.
2.
Ignition “OFF.”
Does scan tool indicate TP sensor voltage
less than the specified value?
.36
Volt
Step 3
Step 5
3
1. Ignition “OFF.”
2.
Disconnect TP sensor harness connec-
tor.
3.
Connect a jumper wire from harness ter-
minal “A” (CKT 416) to harness terminal “B”
(CKT 417).
4.
Ignition “ON,” engine “OFF.”
Does scan tool indicate TP sensor voltage
greater than the specified value?
4
4
Volts
Step 8
Step 4
4
5
1. Ignition “OFF.”
2.
Connect DVOM from harness terminal
“A” (CKT 416) to a known good ground.
Does scan tool indicate TP sensor voltage
greater than the specified value?
Volts
–
Step 7
–
Step 6
–
Trouble code 22 is intermittent. Locate and
repair intermittent faulty connections. Refer to
“Diagnostic Aids”.
Page 5G-46
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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