Troubleshooting guide

DDEC IV TESTING

Intermittent Black Smoke

Perform the following steps for Intermittent Black Smoke.

1. Check for diagnostic trouble codes.

[a] If Fault Codes are logged, diagnose the logged codes first.

2. Visually inspect the air filter restrictions.

[a] If the air filter is clogged or dirty, replace the air filter.

3. Visually inspect the air inlet hoses for soft or collapsed areas.

[a] If the air inlet hoses are damaged, replace as necessary.

4. Visually inspect the air inlet for restrictions.

[a] If the air inlet has restrictions, clean as necessary.

5. Perform Test A .Page5–7.

6. Perform Exhaust Gas Recirculation System Basic Checks. .Page5–9.

7. Te st drive the vehicle with DDDL and perform a snapshot. Analyze the snapshot.

8. Perform Test B .Page5–8.

5-2 All information subject to change without notice. (Rev. April 2004)