PleasureCraft Engine Group 5.0L, Diagnostic Manual

Page: 231 / 337

5.0/5.7/6.0/8.1L Diagnosis 5 - 89
MEFI 4 - PCM
DTC 22 - Throttle Position (TP) Sensor Circuit - Signal Voltage Low (Scan Diagnostics)
Step Action Value Yes No
1
Was the “On-Board Diagnostic” (OBD) system check Go to OBD
performed? — Go to Step 2 System Check
1. Throttle closed.
2
2. Turn ignition ON, leaving engine OFF.
Does scan tool indicate TP sensor voltage less than the
specifi ed value? .36 volt Go to Step 3 Go to Step 5
1. Turn ignition OFF.
2. Disconnect TP sensor harness connector.
3. Connect a jumper wire from harness terminal “A”
3
(CKT 416) to harness terminal “C” (CKT 417).
4. Turn ignition ON, leaving engine OFF.
Does scan tool indicate TP sensor voltage greater than the
specifi ed value? 4 volts Go to Step 8 Go to Step 4
1. Turn ignition OFF.
2. Connect DMM from harness terminal “A” (CKT 416)
4
to a known good ground.
3. Turn ignition ON, leaving engine OFF.
Does DMM indicate a voltage greater than
the specifi ed value? 4 vts Go to Step 7 Go to Step 6
DTC 22 is intermittent. Locate and repair intermittent
5
faulty connections.
•
Refer to “Diagnostic Aids.” — — —
Locate and repair open or short to ground in CKT 416.
6
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? — Verify repair Go to Step 9
Locate and repair open or short to ground in CKT 417. If a
7
problem is found, repair as necessary.
Was a problem found? — Verify repair Go to Step 9
8
Replace faulty TP sensor.
Is action complete? — Verify repair —
9
Repair faulty ECM connections or replace faulty ECM.
Is action complete? — Verify repair —