DRIVEABILITY AND EMISSIONS 6E1-69
Diagnostic Aids
Important: Be sure to inspect ECM and engine
grounds for being secure and clean.
A short to voltage in one of the sensor input circuits
may cause one or more of the following DTCs to be
set:
• 21/33
Important: If a sensor input circuit has been shorted
to voltage, ensure that the sensor is not damaged. A
damaged sensor will continue to indicate a high or low
voltage after the affected circuit has been repaired. If
the sensor has been damaged, replace it.
A short to ground in the circuit between ECM and
sensors will cause one or more of the following DTCs
to be set:
• 14/22
• 34/69
Check for the following conditions:
• Poor connection at ECM. Inspect the harness
connectors for backed-out terminals, improper
mating, broken locks, improperly formed or
damaged terminals, and a poor terminal-to-wire
connection.
• Damaged harness. Inspect the wiring harness for
damage. If the harness is not damaged, observe an
affected sensor's displayed value on the Scan Tool
with the ignition ON and the engine OFF while you
move the connectors and the wiring harnesses
related to the following sensors:
• IAT
• ECT
• TPS
• MAP
Multiple ECM Information Sensor DTCs Set
Step Action Value(s) Yes No
1
Was the “On-Board Diagnostic (OBD) System
Check” performed?
- Go to Step 2
Go to OBD
System
Check
2
1. Turn the ignition OFF disconnect the ECM.
2. Turn the ignition ON check the 5 volt reference circuits
for the following conditions:
• A poor connection at the ECM.
• An open between the ECM connector and the splice.
• A short to ground.
• A short to voltage.
Is there an open or short?
-
Go to Step 3 Go to Step 4
3
Repair the open or short.
Is the action complete?
-
Verify repair
-
4
Check the sensor ground circuit for the following
conditions:
• A poor connection at the ECM or the affected sensors.
• An open between the ECM connector and the affected
sensors.
Is there an open or a poor connection?
-
Go to Step 5 Go to Step 6
5
Repair the open or the poor connection.
Is the action complete?
-
Verify repair
-
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