1992 saturn coupe 4 cyl motor twin cam

Posted by emissionwiz on Sep 22, 2008

DTC PARAMETERS Perform these test to find the cause
DTC 26 is set when the PCM has detected the following conditions for more than four seconds twice per ignition cycle.

• Engine speed greater than 908 rpm.
• Turbine speed is between 224 and 2800 rpm.
• TCC is commanded to release for more than 0.25 seconds.
• Load value (engine torque) is greater than 100.
• Speed delta (engine speed - turbine speed) across torque converter is less than 84 rpm.

1. Check for information flags 79, 93, or 96. They must be eliminated first as a possible cause of DTC26.
2. Check actuator operation. Use actuator quick check. The actuator quick test will Pulse Width Modulate (PWM) the actuators at a set rate. Listen and compare the noise of TCC gear actuator to that of other actuators. The noise of all should be similar.
3. The TCC release circuit may be leaking at the seal ring on the input shaft. This would allow release pressure to leak off to converter out circuit or lube circuit. Also a remote possibility is the ball pressed into the input shaft is loose.

• When the PCM detects a fault in the circuit (open ground, short), the PCM will open the circuit internally to protect the circuit.
• On 1992 2nd design, 1993 and 1994 vehicles, the TCC may be detected as stuck on when the transaxle is put into drive range. If TCC is stuck on at start-up, a stall may occur, and after a restart it will result in a 3rd or 4th gear start.