Tech 2 Displays No Communication with EFCM - keywords 4.4 4.6 6.0 7.0 exhaust flow module rear valve
| Subject: | Tech 2 Displays No Communication with EFCM |
| Models: | 2006 Cadillac XLR and XLR-V |
| 2006 Chevrolet Corvette C6 and Z06 |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
When performing diagnostics using the Tech 2, it may be noted that there is no communication with EFCM module. The EFCM stands for Exhaust Flow Control Module. Its purpose is to control the exhaust valve at the tailpipe and is only equipped on the 2006 Cadillac XLR-V (4.4L V8 RPO LC3 Supercharged) and Chevrolet Corvette Z06 (7.0L V8 RPO LS7).
Recommendation/Instructions:
On vehicles with out the EFCM, the Tech 2 will display no communication with the EFCM. This is a normal operation of the Tech 2. Ignore the module if the vehicle is not equipped and continue with diagnostics.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
