3406B (PEEC) PROGRAMMABLE ELECTRONIC ENGINE CONTROLS Caterpillar

PEEC Truck Engines

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 Diagnostic Code 25, Boost Pressure Sensor Fault, through correction of boost diagnostic change.

2. Fix low idle instability problems with Rack Solenoid (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. Intermittent codes can be read using a separate momentary switch, but are not yet logged into permanent memory.

3. Improved vehicle speed sensor diagnostics (Codes 31 and 36 both limit to Engine Rpm at VSL).

4. Improved limp home for throttle position sensor fault (can now go up to Engine RPM at VSL -could previously only go to PTO Engine RPM Limit).

5. 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 diagnostic 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, Diagnostic Code 48 will be logged and engine performance will be inhibited (limited to 1350 rpm in gear) until the diagnostic code is cleared.

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

3. Diagnostic lamp actuation with cruise control switches. Momentary push button will no longer operate lamp to flash out diagnostic codes. To read code, switch the cruise control ON/OFF switch to the OFF position. Then hold the SET/RESUME switch in the RESUME position until the code 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. Throttle Position Sensor must now be adjusting using "Duty Cycle" rather than "Throttle Position".

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

6. Addition of Diagnostic Code 41, Vehicle Overspeed Warning. Diagnostic 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 diagnostic code is activated. The only codes that will disable cruise control are the vehicle speed fault codes 31 and 36.

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

9. Improved diagnostics for Diagnostic Code 43, Rack Actuator or Sensor Fault (fixes problem in software for this code).

10. Cold Mode Operation displayed with ECAP service tool.

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.

May 1990

Effective with 8TC13244 and 5YG00392.

1. Acceleration rate limiting above 1500 rpm is eliminated; eliminates hesitation at 1400 to 1600 rpm.

2. Engine speed Diagnostic Codes 33, 34, and 35 are now permanently logged.

3. Diagnostic Code 01 (Override Of Idle Shutdown Timer) added. This tattletale increments each time there is an operator override of the idle shutdown timer.

4. Override for Diagnostic Code 31 (Loss Of Vehicle Speed Signal) added. PEEC will never initiate Diagnostic Code 31 if rpm at vehicle speed limit is set to 3000.

5. Idle shutdown timer improved to reduce the possibility of engine shutdown during light load PTO usage.

6. Improved tampering detection (reduced recognition time for Code 48).

7. Fault logging available 10 seconds after cold mode (was one minute) and is less susceptible to electrical voltage spikes from solenoids and relays.

8. The 350 hp LCV NAR rating has an enhanced performance strategy. New timing maps improve economy and performance.

9. Diagnostic Code 55 (No Detected Faults) is now flashed on diagnostic lamp. Code 34 is still displayed on the service tool.