Check For The Following Conditions - Isuzu C22NE Workshop Manual

6E1-134 DRIVEABILITY AND EMISSIONS
Diagnostic Aids

Check for the following conditions:

• Poor connection at ECM - Inspect harness
connectors for backed-out terminals, improper
mating, broken locks,
damaged terminals, and poor terminal-to-wire
connection.
Step
Was the "On-Board Diagnostic (OBD) System Check"
1 performed?
1. Ignition ON, engine OFF.
2. With the throttle closed, observe the "Throttle Position
2
Sensor" display on the Scan Tool. is the "Throttle
Position Sensor" below the specified value?
1. Ignition ON engine OFF.
2. Using a Scan Tool, monitor info for Diagnostic Trouble
3 Code 22.
Does the Scan Tool indicate Diagnostic Trouble Code 22
failed?
1. Ignition OFF.
2. Disconnect the Throttle Position sensor electrical
connector.
3. Jumper the 5 volt reference circuit and the Throttle
Position signal together at the Throttle Position sensor
4
harness connector.
4. Ignition ON.
Observe the "Throttle Position Sensor" value displayed
on the Scan Tool.
Is the "Throttle Position Sensor" at the specified value?
1. Disconnect jumper.
2. Connect a test light between B+ and the Throttle
Position sensor signal circuit at the Throttle Position
5 sensor harness connector.
Observe the "Throttle Position Sensor" value displayed
on the Scan Tool.
Is the "Throttle Position Sensor" at the specified value?
improperly formed
DTC (Flash DTC = 22)
Throttle Position (TP) Sensor Circuit Low Input
Action
• Damaged harness - Inspect the wiring harness for
damage. If the harness appears to be OK, observe
the throttle position display on the Scan Tool while
moving connectors and wiring harnesses related to
the throttle Position sensor. A change in the display
or
will indicate the location of the fault.
Value(s)
-
0.19V
-
5V
5V
Yes No
Go to OBD
System
Go to Step 2 Check
Go to Step 4 Go to Step 3
Refer to
Diagnostic
Go to Step 4 Aids
Go to Step 10 Go to Step 5
Go to Step 6 Go to Step 8