PleasureCraft Engine Group 5.0L, Diagnostic Manual

Page: 229 / 337

5.0/5.7/6.0/8.1L Diagnosis 5 - 87
MEFI 4 - PCM
DTC 21 - Throttle Position (TP) Sensor Circuit - Signal Voltage High (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 greater than
the specifi ed value? 4 volts Go to Step 3 Go to Step 5
1. Turn ignition OFF.
2. Disconnect TP sensor harness connector.
3
3. Turn ignition ON, leaving engine OFF.
Does DMM indicate a voltage less than the
specifi ed value? .36 volt Go to Step 4 Go to Step 6
Connect DMM from harness terminal “A” (CKT 416) to
4
harness terminal “B” (CKT 814).
Does DMM indicate a voltage greater than
the specifi ed value? 4 volts Go to Step 8 Go to Step 7
DTC 21 is intermittent. Locate and repair intermittent faulty
5
connections.
•
Refer to “Diagnostic Aids.” — — —
Locate and repair short to voltage in CKT 417. If a
6
problem is found, repair as necessary.
Was a problem found? — Verify Repair Go to Step 9
Locate and repair open in ground CKT 814. If a problem is
7
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 —