Step
| Action
| Value(s)
| Yes
| No
|
1
| Did you perform the Powertrain
On-Board Diagnostic (OBD) System Check?
| --
| Go to
Step 2
| Go to
Powertrain On Board Diagnostic (OBD) System Check
|
2
|
- Carefully remove a preconvertor Heated Oxygen Sensor (HO2S). Refer
to
Heated Oxygen Sensor Replacement
.
- Install the exhaust backpressure tester J 35314-A
in place of the HO2S.
- Start the engine.
Is the reading more than the specified value?
| 8.6 kPa (1.25 psi)
| Go to
Step 4
| Go to
Step 3
|
3
|
- Increase the engine speed to the first specified value.
- Observe the backpressure gauge.
Does the reading exceed the second specified value?
| 2000 RPM
20.7 kPa (3 psi)
| Go to
Step 4
| Go to
Step 6
|
4
|
- Check the exhaust system for a collapsed pipe, internal muffler
failure, or any kind of heat distress. Refer to
Exhaust System Inspection
in Engine Exhaust.
- Repair as necessary.
Did you find a problem?
| --
| Go to
Step 6
| Go to
Step 5
|
5
| Replace the catalytic converter. Refer to
Catalytic Converter Replacement
in Engine Exhaust.
Is the action complete?
| --
| Go to
Step 6
| --
|
6
| Operate the vehicle within the conditions under which the original symptom
was noted.
Does the system now operate properly?
| --
| System OK
| Go to
Step 2
|
