DTC 92

DTC's 91-98 Cylinder Balance Fault:

***This article was updated by TSB No. 51-65-48***

DIAGNOSTIC TROUBLE CODE (DTC) 91-98 WILL SET WHEN
^ Engine Idling.
^ Coolant at operating temperature.
^ Cylinder fault constant.
^ Fuel correction amount exceeds defined limits (internal to Powertrain Control Module (PCM)) for 2 seconds.

ACTION TAKEN (PCM WILL DEFAULT TO)
^ Rough idle.
^ DTC will be stored as a current and history code, but will not turn on the Malfunction Indicator Lamp (MIL).

DTC 91-98 WILL CLEAR WHEN
Fault condition no longer exists.

DTC CHART TEST DESCRIPTION
1. This step will determine if there is a specific cylinder at fault by using cutout (INJECTOR BALANCE). If a specific cylinder is not responding to cylinder cutout (RPM drop), this cylinder should be considered a suspect cylinder.
2. This step will determine if a faulty dual mass flywheel is setting multiple cylinder balance DTC's.

DIAGNOSTIC AIDS
To properily identify suspect cylinders, a scan tool must be used. The scan tool "INJ BALANCE" test will cut out the specific cylinder requested. The scan tool will cut out a specific cylinder for 60 second intervals (you can repeat cylinder cutout for the same cylinder as needed). Faulty injection nozzles will set cylinder balance DTC's and should always be checked first. A nozzle can be swapped from one cylinder to another as a quick check to identify a fault.