Toyota Model 7HBW23 Service Manual
Section 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. (Code C28 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 (Code E142 may be displayed)
How to Clear Code
Code is cleared when voltage recovers.
00700-CL340-05, Issued: 2 May 2005
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