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Toyota Forklift Fault Codes & Error Codes

Searchable database of 40+ Toyota forklift diagnostic codes. Find codes for electric (7-series, 8-series) and IC (4Y-ECS) models with detailed troubleshooting steps.

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Before You Start

  • • Record the exact code displayed on your forklift
  • • Note any symptoms: Strange sounds, performance issues, etc.
  • • Check your model number: Use our serial lookup tool
  • • Have your manual handy for model-specific details
Showing 40 codes

⚡Most Common Codes

E A5-1
Medium
Vehicle speed control system fault
Speed control issues
View Full Guide →
E AS-1
Low
Alarm code
Seat switch issue
⛽ Internal Combustion Engine Codes (19)▼
01-01Fuel feedback control error rich
High
System: 4Y-ECS (gasoline)
Symptom: Engine speed unstable, may stop
Causes: Intake/exhaust defects, sensor/ignition/fuel issues, harness defect, controller fault
Fix: Use diagnostic software; check O2 sensor and wiring
01-02Fuel feedback control error lean
High
System: 4Y-ECS (gasoline)
Symptom: Engine speed unstable, may stop
Causes: Similar to 01-01; exhaust/ignition defects
Fix: Inspect wiring; test sensor resistance
01-03Fuel feedback control error rich
Medium
System: 4Y-ECS (LPG/CNG)
Symptom: Display only
Causes: Sensor defect, fuel system issues
Fix: Check O2 sensor; verify connections
01-04Fuel feedback control error lean
Medium
System: 4Y-ECS (LPG/CNG)
Symptom: Engine may have problem at low temperatures
Causes: Exhaust/ignition defects
Fix: Inspect wiring harness; replace sensor if faulty
01-05O2 sensor open abnormality
Medium
System: 4Y-ECS
Symptom: Engine may have problem at low temperatures
Causes: Harness defect, failed sensor
Fix: Replace O2 sensor; test with multimeter
01-06O2 sensor heater open abnormality
Medium
System: 4Y-ECS
Symptom: Limiting speed due to limited engine power
Causes: Heater circuit issue
Fix: Check connections; calibrate or replace
02-01Intake temperature sensor open abnormality
Medium
System: 4Y-ECS
Symptom: Engine may have problem
Causes: Sensor defect
Fix: Test sensor resistance; inspect wiring
02-02Intake temperature sensor short abnormality
Medium
System: 4Y-ECS
Symptom: Engine problem at low temperatures
Causes: Short circuit
Fix: Replace sensor; check ECU connections
03-01Intake pipe pressure sensor open
Medium
System: 4Y-ECS
Symptom: Limiting speed due to limited power
Causes: Open circuit
Fix: Verify with multimeter; replace if faulty
03-02Intake pipe pressure sensor short
Medium
System: 4Y-ECS
Symptom: Limiting speed
Causes: Short to ground
Fix: Inspect throttle body wiring
04-01Coolant temperature sensor open
High
System: 4Y-ECS
Symptom: Engine speed unstable, may stop
Causes: Sensor open
Fix: Calibrate or replace; check wiring
04-02Coolant temperature sensor short
High
System: 4Y-ECS
Symptom: Engine unstable
Causes: Short circuit
Fix: Use analyzer for testing
05-01Throttle position sensor 1 open
High
System: 4Y-ECS
Symptom: Engine unstable
Causes: Open abnormality
Fix: Test continuity; replace solenoid
05-02Throttle position sensor 1 short
Medium
System: 4Y-ECS
Symptom: Limiting speed
Causes: Short
Fix: Inspect connections; recalibrate
05-03Throttle position sensor 2 open
Low
System: 4Y-ECS
Symptom: Display only
Causes: Open abnormality
Fix: Check load cell; test sensor
05-04Throttle position sensor 2 short
Medium
System: 4Y-ECS
Symptom: Fuel specification changeover switch error
Causes: Short
Fix: Replace switches; inspect wiring
06-01Throttle motor drive circuit open abnormality
High
System: 4Y-ECS
Symptom: Engine may stop
Causes: Open circuit
Fix: Use analyzer mode for testing
11-1EGR position sensor circuit open abnormality
Medium
System: EGR
Symptom: High input
Causes: Open circuit
Fix: Check sensor
12-4Variable nozzle turbo actuator malfunction
Medium
System: Turbocharger
Symptom: Feedback malfunction
Causes: Feedback issue
Fix: Test feedback
🔋 Electric Forklift Codes (8)▼
F8Charging completion failure
Medium
System: Electric Charging
Symptom: Charging failure
Causes: Disconnected cables during charging
Fix: Verify transformer connections
C02Error in multi-display functions
Low
System: Display
Symptom: Abnormalities detected
Causes: Display circuit issue
Fix: Test circuits
C05Error in display or related functions
Low
System: Display
Symptom: Similar to C02
Causes: Display fault
Fix: Analyzer mode
AD1CAN communication error
High
System: CAN Comm
Symptom: Partial drive limitation
Causes: Faulty harness or controller
Fix: Inspect CAN bus
ADE2Lost communication
High
System: CAN Comm
Symptom: Drive/mast functions restricted
Causes: Comm loss
Fix: Reset and test
201-262Drive logic unit errors
High
System: Traction Logic (8-series)
Symptom: May disable traveling
Causes: Main circuits/sensors abnormalities
Fix: Use analyzer for traction testing
501-562Lifting logic unit errors
High
System: Lift Logic
Symptom: Abnormalities in lift circuits
Causes: Sensors/circuits fault
Fix: Test sensors and circuits
F5-1Material handling error
Medium
System: Material Handling
Symptom: Lift may stop
Causes: Solenoid or potentiometer fault
Fix: Check wiring
🛡️ SAS/OPS Stability & Safety Codes (11)▼
41-1Matching connector abnormal
Medium
System: SAS/OPS
Symptom: Only connector display faulty
Causes: Broken matching cable or controller
Fix: Inspect connections; replace cable
51-1Speed sensor open
Medium
System: SAS/OPS
Symptom: Speed shows 0 km/h, swing control limited
Causes: Faulty connector/sensor
Fix: Test with multimeter
52-1Yaw rate sensor open
Medium
System: SAS/OPS
Symptom: Swing control limited
Causes: Damaged cable/sensor
Fix: Calibrate yaw rate
61-1Load sensor open
High
System: SAS/OPS
Symptom: Swing/mast/drive limited, no load display
Causes: Broken connector/sensor
Fix: Inspect load cell
62-1Tilt angle sensor open
Medium
System: SAS/OPS
Symptom: Mast control limited
Causes: Faulty sensor/cable
Fix: Recalibrate tilt
63-1Tilt switches ON simultaneously
Medium
System: SAS/OPS
Symptom: Mast limited
Causes: Faulty switch installation
Fix: Replace switches
64-1Lift lower lock solenoid open
High
System: SAS/OPS
Symptom: Fork won't lower
Causes: Broken solenoid/cable
Fix: Test continuity
A5Seat switch abnormal (sit-down electric)
High
System: SAS/OPS
Symptom: Drive & hydraulic operate even if not seated
Causes: Faulty connector, damaged cable, broken switch, controller fault
Fix: Inspect seat switch
A7-1Abnormal brake switch
Medium
System: SAS/OPS
Symptom: Partial restriction of drive control
Causes: Broken brake switch/cable
Fix: Replace switch
H1-1Lift lever potentiometer abnormal
High
System: SAS/OPS
Symptom: Lift cannot operate
Causes: Damaged potentiometer wire
Fix: Replace potentiometer
H2-1Tilt lever potentiometer abnormal
High
System: SAS/OPS
Symptom: Tilt does not operate
Causes: Damaged wire
Fix: Replace

General Toyota Fault Code Troubleshooting

When your Toyota forklift displays an error code, follow these general steps:

  1. Record the code - Write down the exact code and when it appeared
  2. Check basic systems - Battery voltage, connections, fluid levels
  3. Consult your manual - Model-specific codes may vary
  4. Use diagnostic tools - OBD scanners can read detailed fault data
  5. Clear and retest - Some codes can be cleared after fixing the issue

When to Call for Professional Help

  • Code persists after basic troubleshooting
  • Multiple codes appear simultaneously
  • High severity codes (electrical, safety systems)
  • You're unsure about the diagnosis
  • Equipment is needed urgently

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Related Toyota Forklift Resources

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Toyota Serial Number Lookup
Identify your forklift's year and model
📚
Toyota Brand Hub
Parts, guides, and resources
⚡
E A5-1 Code Guide
Speed control system troubleshooting
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Expert Support
Talk to Toyota specialists

Important Notice

Fault codes can vary by Toyota forklift model, year, and system type (electric vs IC). Always consult your specific model's service manual for accurate diagnostics. If you need help identifying codes specific to your Toyota forklift, contact our technical team with your model and serial number.