Enhanced ignition discharge module for Trionic 7: Notes

Fig 1: Diagnosing Ignition Discharge Module

Courtesy of SAAB-SCANIA OF AMERICA, INC.

New T7 software has been developed to allow Tech2 to diagnose the ignition discharge module more accurately. The software also contains an improvement which prolongs the service life of the ignition discharge module. The software was introduced into production (9-5 M03) from Vehicle Identification Number 33041133. The T7 software has also been developed for earlier model years of 9-5 and 9-3 and is available via SPS (TIS2000).

The T7 software has been produced for cars with engine B235 M00-

The diagnosis does not generate any type P diagnostic trouble codes but supplements the normal diagnosis. The type P diagnostic trouble codes always have priority in the fault diagnosis. For this reason the diagnostic trouble codes must be read in the normal way and remedied in accordance with the fault diagnosis description in WIS.

The following diagnostic trouble codes are related to the ignition discharge module:

P0327 Knock Sensor Circuit. Low Input, Bank 1.
P0332 Knock Sensor Circuit. Low Input, Bank 2.
P1310 Ignition Discharge Module. Not Powered, Bank 1.
P1320 Ignition Discharge Module. Not Powered, Bank 2.

The following diagnostic trouble codes are also related to soot on the spark plugs:

P0340 Camshaft Position Sensor. Malfunction.
P1312 Combustion Detection Cyl. 1+2. Open Circuit/Short to B+.
P1313 Combustion Detection Bank 1. Open Circuit/Short to B+.
P1324 Combustion Detection Cyl. 3+4. Open Circuit/Short to B+.
P1334 Combustion Detection Cyl. 3+4. Open Circuit/Short to B+.

If none of the above diagnostic trouble codes are suspected, connect T7 with Tech2 and select "Ignition Discharge Module Diagnose" under the menu "Diagnostic Trouble Codes (DTC)".

If the enhanced diagnosis function is not in the software then text is displayed which states that the function is not supported (SPS programming can later be used to obtain the diagnosis capability). If the diagnosis exists then the value/code for "Current Status", "Failure Status" and "IDM Check Code" are displayed. An information text explains "Current Status" in plain text is displayed in Tech2.