FAILURE DIAGNOSIS
1-8
TNV DI Service Manual
DTCs (Diagnostic Trouble Codes) General Description
Analog Input Related Failures
Rack position sensor
(1) P1202/4: Failure with Rack Position Sensor (Low Voltage)
DTC Detecting Conditions
Movement at Error occurrence
Estimation of Failure cause/Error condition
• The connector may not be properly connected.
• Wiring defect of the harness
•
The rack position sensor's signal wires may be disconnected or short-circuited with GND.
•
The SENSOR 12V wire may be disconnected or short-circuited with GND (*NOTE).
•
The SENSOR GND wire may be short-circuited with POWER SUPPLY (*NOTE).
*NOTE) If the SENSOR 12V wire is short-circuited with GND or SENSOR GND wire is short-circuited with
POWER SUPPLY, the E-ECU's power supply line fuse 10A might be blown.With this fuse blown, the
E-ECU may fail to detect/indicate the error, and to store the error history.
The rack position sensor may be faulty.
•
Output defect of the rack position signal by a disconnection or a short circuit of the inner wiring
• The E-ECU internal circuitry may be faulty.
DTC
P1202/4
Rack Position Sensor Error (Low Voltage)
1 - Precondition; 2 - Detecting condition(s);
3 - Flashing pattern of failure indicator
Check points
1. Key switch ON.
2. The sensor voltage lower limit and below [at E-ECU activation,
engine running]
3. Seven flashes.
Connector
Harness
Rack position sensor
E-ECU
Error Mode
[Run Under Restrictions]:
The engine continues to run in on-error engine control mode.
If any error is detected at E-ECU activation, it takes 1 - 10 seconds from the starter
begins to rotate until the engine starts.
Run restricted?
Yes: • The High idle speed is restricted to one of the following, whichever smaller:
•
80% of the pre-error High idle speed
•
150% of the Low idle speed
• The fuel injection rate is restricted.
Recovery
Conditions
No.
Remarks
The High and Low idle speeds must be equal to those specified in the engine
specifications.
TNV_DI_SM_A4-Troubleshooting.book 8 ページ ２００７年１１月１５日 木曜日 午後５時２７分
