1989/11/01 Caterpillar

Effective Dates, Serial Numbers And Features Of PEEC Personality Modules

Usage:

3406B (PEEC) Truck Engines

Each production change listed in this article is added to the previous change(s).

April 1987

Original PEEC personality module, 1987 model year, engine serial numbers 8TC1-1412.

October 1987

Beginning of 1988 model year, effective with 8TC1413. Update: Programming Low Idle rpm.

November 1987

Update: Improve customer specified parameter fault detection. Parameter that is programmed incorrectly can be displayed with ECAP (electronic control analyzer programmer).

April 1988

Update: Improvements to torque map for 425 hp rating.

September 1988

Effective with 8TC6047.

Updates:

1. Elimination of intermittent Fault Code 25, Boost Pressure Sensor Fault, through correction of boost diagnostic change.

2. Fix low idle instability problems with rack BTM.

October 1988

Beginning of 1989 model year (emissions same as in 1988), effective with 8TC6561.

Updates:

1. Addition of idle shutdown timer feature.

2. Addition of intermittent (temporary, key ON) fault logging.

3. Improved tampering detection.

4. Improved vehicle speed sensor diagnostics.

5. Improved limp home for throttle position sensor fault.

6. Allow acceleration to high idle when vehicle is out of gear.

April 1989

Personality module serial numbers 10000-Up, effective with 8TC7985.

Update: Fix to correct intermittent shutdowns, communication problems, and inconsistent fault codes.

May 1989

Personality module serial numbers 20000-Up, effective with 8TC8565.

Updates:

1. Enhanced detection of tampering. Engine performance is monitored to detect and permanently log tampering. When tampering has been detected, Fault Code 48 will be logged and engine performance will be inhibited (limited to 1350 rpm in gear) until the fault code is cleared.

2. Addition of permanent fault logging. Fault codes will be logged into permanent memory if they occur after the engine has been running in warm mode at least one minute.

3. Diagnostic lamp actuation with cruise control switches. Momentary push button will no longer operate lamp to flash out fault codes. To read faults, switch the cruise control ON/OFF switch to the OFF position. Then hold the SET/RESUME switch in the RESUME position until the fault sequence is flashed out. All current faults, and all faults that have been logged since the key was turned ON, will then be flashed out.

4. Autocal software for use with a pedal-mounted throttle position sensor.

5. Rack and timing sensor calibration no longer automatically calibrate boost sensor. Boost sensor must now be calibrated separately.

6. Addition of Fault Code 41, Vehicle Overspeed Fault Fault Code 41 is logged any time the vehicle speed exceeds the programmed vehicle speed limit by 5 mph for 5 seconds.

7. PEEC will no longer disable cruise control or power take-off operation if a fault code is activated. The only fault codes that will disable cruise control are the vehicle speed fault codes.

8. Fault Code 46, Low Oil Pressure, will not be generated until the engine has been running for at least 10 seconds. Only Fault Code 34, Loss Of Engine Speed Signal, will be "active" with the key turned ON and engine not running.

9. Improved diagnostics for Fault Code 43, Rack Actuator or Sensor Fault.

10. Cold Mode Operation displayed with ECAP service tool.

11. 310 hp Multi-Torque (310 MT CARB) Rating.

12. 350 hp CARB Rating.

July 1989

Personality module serial numbers 30000-Up, effective with 8TC9090.

Update: Addition of chip to personality module circuit board to aid in permanent fault logging strategies.

Parts List

The chart lists the new and former serviced parts and their comparable Remanufactured (0R) parts. The engineering change number is also shown after each part number. Current personality modules (shown in the far right column) are adaptable to all previous engines.

When ordering replacement modules, ALWAYS order the remanufactured module ( "0R" part number). Ordering the production module will result in unnecessary delays.

Abbreviations used: