Loses speedometer/odometer and very erratic shifting together intermittently

For the code 26, I am showing a fault with the quad driver module. This is an internal PCM component. The 32 is related to the EGR circuit. I have done a bit of research and found the most common cause of these two codes to appear together is the EGR solenoid. After continuing, I came across a technical service bulletin. Take a look at this. It indicated what needs checked.

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1995 Saturn Sedan L4-1.9L DOHC VIN 7
Engine Controls - DTC's 26, 32 & Flag 27 Manual Updates
Vehicle Powertrain Management Technical Service Bulletins Engine Controls - DTC's 26, 32 & Flag 27 Manual Updates
ENGINE CONTROLS - DTC'S 26, 32 & FLAG 27 MANUAL UPDATES
BULLETIN NO: 96-T-08

ISSUE DATE: January, 1996

GROUP/SEQ. NO: Engine-01

CORPORATION NO: 686001

SUBJECT:
Diagnostic Service Information on PCM/EC DTCs 26 and 32, and Information Flag 27

MODELS AFFECTED:
1991 - 1995 Saturns

PURPOSE:
The diagnostic flow carts for diagnostic trouble code (DTC) 26 and Information Flag 27, in the "1991-1994 Electronic Engine Controls Service Manual, " and for DTCs 26 and 32 and for Information Flag 27 in the "1995 Electronic Engine Controls Service Manual" have incorrect resistance specifications. Also, some of the resistance specifications under the "Diagnostic Aids" for these DTCs and Information Flags are incorrect.

It is important to note that only a short or open in a solenoid, relay, bulb or related wiring or electrical connections can cause the PCM to set DTCs 26 or 32, or Information Flag 27. A resistance in the output circuits between 5 and 10,000 ohms will not cause DTCs 26 or 32, or Information Flag 27.

Beginning diagnosis with resistive measurements of the solenoid will likely result in mis-diagnosis. If the fault is present during diagnosis, follow the diagnostic flow chart for the DTC or Information Flag. If the fault is intermittent, attempt to test the quad driver module (QDM) outputs under similar operating conditions as represented by the malfunction (MALF) history records, stored in the PCM. Exercise the QDM with "Special Test" function in the portable diagnostic tool (PDT) or service stall system (SSS).

If a solenoid or relay is not within the specifications stated under the "Diagnostic Aids" for the DTC or Information Flag, it does not mean that the solenoid or relay was the reason the DTC or Information Flag was set. It could mean that the solenoid or relay operates sluggishly or too rapidly, but unless the solenoid or relay opened or shorted, it cannot have caused the DTC or Information Flag to have been set in PCM memory.

Refer to the chart following and make the corrections in the service manuals as noted. 1991-1994 Electronic Engine Controls Service Manual

Page ENEC 70 (DTC 26), under "Diagnostic Aids, " change:

- EGR solenoid resistance specification from 37-44 ohms to 20-50 ohms.

- EVAP canister purge solenoid resistance specification from 22-42 ohms to 20-50 ohms.

Page ENEC 72 (DTC 26), in first box of flow chart, change:

- EGR solenoid resistance specification from 37-44 ohms to 5-10,000 ohms.

- EVAP canister purge solenoid resistance specification from 22-42 ohms to 20-50 ohms.

Page ENEC 120 (Information Flag 27), under "Diagnostic Aids, " change:

- EGR solenoid resistance specification from 37-44 ohms to 20-50 ohms.

- EVAP canister purge solenoid resistance specification from 22-42 ohms to 20-50 ohms.

1995 Electronic Engine Controls Service Manual

Page ENEC 68 (DTC 26), under "Diagnostic Aids, " change:

- Linear EGR solenoid resistance specification from 7-9 ohms to 7-10 ohms.

- EVAP canister purge solenoid resistance specification from 22-42 ohms to 20-50 ohms.

Page ENEC 69 (DTC 26), in the flow chart box "is the resistance of the EVAP canister purge solenoid between 22-42 ohms?" Change resistance specification to 20-50 ohms.

Page ENEC 72 (DTC 32), under "Diagnostic Aids, " change:

- Linear EGR solenoid resistance specification from 7-9 ohms to 7- 10 ohms.

- EVAP canister purge solenoid resistance specification from 22-42 ohms to 20-SO ohms.

Page ENEC 114 (Information Flag 27), under "Diagnostic Aids, " change;

- Linear EGR solenoid resistance specification from 7-9 ohms to 7-10 ohms.

- EVAP canister purge solenoid resistance specification from 22-42 ohms to 20-50 ohms.

Page ENEC 115 (Information Flag 27), in the flow chart box "Is the resistance of the EVAP canister purge solenoid between 22-42 ohms?" Change resistance specification to 20-50 ohms.

Joe

Hey buddy, sorry I forgot the pin layout. And I couldn't agree more with you. Nothing is easy. Wait until you get to deal with can bus circuits. LOL One wire covering multiple circuits!

I attached a pic of the pin layout for you. Let me know if it helps.

Joe

No question is stupid. Pins A and B. Note that you are checking the sensor and not the supply, so determine which pins are A and B on the solenoid.

You need to check A to B.

There should be something unless it shorted internally. You may have found the problem. If there is nothing, it has to be bad.

Good eye! Here is what I have. The two pics correlate with this info.

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TCC STUCK ON
When TCC is commanded off, the engine speed to turbine speed ratio (delta) is monitored to assure TCC is off. TCC stuck on indicates that TCC was commanded off but the actual ratio (delta) across the torque converter, (engine speed/turbine speed), is one to one or TCC on. TCC is turned off by opening circuit 422 at the PCM/TC. A TCC stuck on will usually cause the engine to stall when reverse is selected.

DTC PARAMETERS
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.

TEST DESCRIPTION
Numbered steps below refer to numbered steps on chart.
1. Check for information flags 79 or 96. They must be eliminated first as a possible cause of DTC 26.

NOTE: Prior to performing actuator quick check, the fuel pump probe hole must be connected to 12 volts. See "Actuator Quick Check" procedures. See: Automatic Transmission/Transaxle > Component Tests and General Diagnostics

2. Check actuator operation. The actuator quick test will 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.

DIAGNOSTIC AIDS

When the PCM detects a fault in the circuit (open, ground, short), the PCM will open the circuit internally to protect the circuit.
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.

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Let me know if this helps.

Take care,

Joe

Marc,

The directions incorporate the use of an OBD1 scanner. That is why it may be confusing you. I have to be honest, I work on them all the time and don't have an OBD1 scanner. If you do, let me know.

Joe

If it was a 1996, that would make things a lot easier. As far as the 5.6V, that sounds correct. The shifting issues and TCC issues I feel are all tied to the problem.

When you look through the TCC diagnostic steps, what part is confusing to you? Is there something I can do to try and help?

Joe