Toyota Model 7HBW23 Service ManualSection 5. Troubleshooting

Control Handle Display and Programming

Code C28 - Master Control ON/OFF Switch Warning

Possible Causes and Corrective Actions

•Master Control ON/OFF switch activated

•Low voltage to power amplifier (especially while lifting or driving) due to over-current or short-circuit.

•Try a known-good battery

•PTC R1 missing, faulty, or tripped (very high resistance, due to excessive current while main contactor is open; should automatically recover).

•Carefully check to see if R1 is hot (tripped). If so, unplug battery and allow it to cool. Locate low impedance path that tripped R1 and correct.

•Wire #24 at 0V due to J5 not connected, blown fuse, or bad wiring.

•Check for 24 V at J5-16

•Short or open circuit in CAN wiring, or electrical noise in CAN wiring due to bad connection or outside interference, both at power ON.

•Check CAN wiring

•Try operating truck in different environment

•Bad power amplifier

Code C29 - Time To Service Warning

Reason See Service Parameter 25 on page 5-19.

Performance Limits None

How to Clear Code See Service Parameter 25 on page 5-19.

Possible Causes and Corrective Actions

Time to perform service or service counter not reset after last service.

Code C41 - Battery Undervoltage Warning

Reason Voltage at power amplifier B+ connection less than 17V. Note: Low voltage can also cause problems such as electrical components not powering up/staying activated and CAN errors.

Performance Limits Truck functions are allowed unless the voltage was below 13V. If voltage was below 13V, the truck must be restarted. (CodeC28 may be displayed)

How to Clear Code Code is cleared when voltage recovers.

Possible Causes and Corrective Actions

Battery voltage less than 17V

•Time to charge battery

•Check for correct voltage

Battery parameter not adjusted correctly. Circuit breaker open due to overloading, or short circuit (a misadjusted brake may have caused overloading leading to an open circuit breaker). Open circuit to power amplifier B+ connection.

•Check cabling

Bad power amplifier

Code C42 - Battery Overvoltage Warning

Reason High voltage (greater than 30V) at power amplifier B+ connection.

Performance Limits When 34V is exceeded, overvoltage cutoff occurs and no truck functions are allowed. Truck may need to be restarted (CodeE142 may be displayed)

How to Clear Code Code is cleared when voltage recovers.

00700-CL340-05, Issued: 2 May

20055-11