Isuzu 1999 RODEO Workshop Manual page 948

the condition that caused the Diagnostic Trouble Code to
be set occurs. This may assist in diagnosing the
condition.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart:
3. A condition that affects other heated oxygen
sensors indicates probable contamination. To avoid
damaging the replacement sensors, correct the
condition which caused the contamination before
replacing the affected sensors.
DTC P1133 – O2 Sensor Insufficient Switching (Bank 1 Sensor 1)
Step
1 Was the "On–Board Diagnostic (OBD) System Check"
performed?
2 IMPORTANT: If any Diagnostic Trouble Codes are set
refer to those Diagnostic Trouble Codes before
proceeding with this diagnostic chart.
1. Engine idling at operating temperature.
2. Operate the vehicle within parameters specified
under "Conditions for Setting the Diagnostic
Trouble Code" criteria.
3. Using a Tech 2, monitor "Diagnostic Trouble Code"
info for Diagnostic Trouble Code P1133 until the
Diagnostic Trouble Code P1133 test runs.
4. Note the test result.
Does the Tech 2 indicate Diagnostic Trouble Code
P1133 failed this ignition?
3 Did the Tech 2 also indicate that the P1153 or P1154
tests failed?
4 1. Perform the "Exhaust System Leak Test" (refer to
Exhaust System). After the "Exhaust System Leak
Test" has been performed, return to this diagnostic.
2. If an exhaust leak is found, repair as necessary.
Was an exhaust leak isolated?
5 Visually/physically inspect the following items:
f
Ensure that the Bank 1 HO2S 1 is securely
installed.
f
Check for corrosion on the terminals.
f
Check the terminals at Bank 1 HO2S 1 and at the
PCM.
f
Check for damaged wiring; shorts to ground,
shorts to battery positive, and open circuits.
Was a problem found in any of the above areas?
6 1. Disconnect Bank 1 HO2S 1.
2. Ignition ON.
3. Using a Digital Voltmeter (DVM) at the PCM side of
the connector, check the voltage between the high
signal circuit and ground. Also measure between
the low signal circuit and ground.
Are both voltages in the specified range?
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Action
5. This step checks for conditions which may cause
the heated oxygen sensor to appear faulty. Correct
any of the described conditions if present.
11. To avoid damaging replacement sensors, correct
the condition which caused the contamination
before replacing the affected sensors.
Value(s)
— Go to Step 2
— Go to Step 3
Go to Step
—
— Go to Step 2
— Verify repair
3–4 mV Go to Step 9
6E1–321
Yes No
Go to OBD
System
Check
Refer to
Diagnostic
Aids
Go to Step 4
11
Go to Step 5
Go to Step 6
Go to Step 7