Restricted Exhaust System Check
Step
| Action
| Value(s)
| Yes
| No
|
1
| Was the Powertrain On-Board Diagnostic(OBD) System Check performed?
| --
|
Go to Step 2
| Go to the
Powertrain On Board Diagnostic (OBD) System Check
|
2
|
- Remove HO2S 1. Refer to
Heated Oxygen Sensor Replacement
.
- Install Exhaust Back pressure tester J 35314-A
or equivalent in place of HO2S 1
- Engine idling at normal operating temperature
- Observe the exhaust system back pressure reading on the gage.
Does reading exceed the specified value?
| 8.6 kPa (1.25psi)
|
Go to Step 4
|
Go to Step 3
|
3
|
- With exhaust eack pressure tester in place of HO2S 1, increase
engine speed to 2000 RPM.
- Observe the exhaust system back pressure reading on the gage.
Does reading exceed the specified value?
| 20.7 kPa (3psi)
|
Go to Step 4
| System
OK
|
4
|
- Reinstall HO2S 1.
- Remove HO2S 2. Refer to
Heated Oxygen Sensor Replacement
.
- Install exhaust back pressure tester J 35314-A
or equivalent in place of HO2S 2
- Engine at normal operating temperature.
- Increase engine speed to 2000 RPM.
- Observe the exhaust system back pressure reading on the gage.
Does reading exceed the specified value?
| 20.7 kPa (3psi)
|
Go to Step 5
|
Go to Step 6
|
5
| Repair restriction in the exhaust
system past the Three Way Catalytic Converter.
Possible faults include:
| • | Internal muffler failure |
Is action Complete?
| --
|
Go to Step 7
| --
|
6
| Replace the Three Way Catalytic Converter.
Is action Complete?
| --
|
Go to Step 7
| --
|
7
|
- Remove HO2S 1. Refer to
Heated Oxygen Sensor Replacement
.
- Install Exhaust Back pressure tester J 35314-A
or equivalent in place of HO2S 1
- Engine idling at normal operating temperature
- Observe the exhaust system back pressure reading on the gage.
Does reading exceed the specified value?
| 8.6 kPa (1.25psi)
|
Go to Step 4
|
Go to Step 8
|
8
|
- With exhaust eack pressure tester in place of HO2S 1, increase
engine speed to 2000 RPM.
- Observe the exhaust system back pressure reading on the gage.
Does reading exceed the specified value?
| 20.7 kPa (3psi)
|
Go to Step 5
| System
OK
|
