DESCRIPTION
The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. The skid control ECU converts these wheel speed signals into a pulse signal and outputs it to the ECM via the combination meter. The ECM determines the vehicle speed based on the frequency of this pulse signal.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
---|---|---|---|---|---|---|
P050031 | Vehicle Speed Sensor "A" No Signal | All of the following conditions are met (1-trip detection logic):
|
| Comes on | DTC stored | SAE Code: P0500 |
Vehicle Condition | |||||
---|---|---|---|---|---|
Pattern 1 | Pattern 2 | Pattern 3 | Pattern 4 | ||
Diagnostic Condition | Park/neutral position switch D input signal is ON. | ○ | ○ | ○ | ○ |
The counter gear speed is 300 rpm or more. | ○ | ○ | ○ | ○ | |
When the vehicle is being driven in 1st gear, the transmission revolution sensor (NT) value is 1450 rpm or more. | ○ | - | - | - | |
When the vehicle is being driven in 2nd gear, the transmission revolution sensor (NT) value is 840 rpm or more. | - | ○ | - | - | |
When the vehicle is being driven in 3rd gear, the transmission revolution sensor (NT) value is 540 rpm or more. | - | - | ○ | - | |
When the vehicle is being driven in 4th gear, the transmission revolution sensor (NT) value is 400 rpm or more. | - | - | - | ○ | |
Malfunction Condition | No vehicle speed signal is transmitted to the ECM. | ○ | ○ | ○ | ○ |
Duration | 2 seconds or more | 2 seconds or more | 2 seconds or more | 2 seconds or more | |
Detection Logic | 1-trip detection logic | 1-trip detection logic | 1-trip detection logic | 1-trip detection logic |
Vehicle Condition | |||||
---|---|---|---|---|---|
Pattern 5 | Pattern 6 | Pattern 7 | Pattern 8 | ||
Diagnostic Condition | Park/neutral position switch D input signal is ON. | ○ | ○ | ○ | ○ |
The counter gear speed is 300 rpm or more. | ○ | ○ | ○ | ○ | |
When the vehicle is being driven in 5th gear, the transmission revolution sensor (NT) value is 330 rpm or more. | ○ | - | - | - | |
When the vehicle is being driven in 6th gear, the transmission revolution sensor (NT) value is 300 rpm or more. | - | ○ | - | - | |
When the vehicle is being driven in 7th gear, the transmission revolution sensor (NT) value is 300 rpm or more. | - | - | ○ | - | |
When the vehicle is being driven in 8th gear, the transmission revolution sensor (NT) value is 300 rpm or more. | - | - | - | ○ | |
Malfunction Condition | No vehicle speed signal is transmitted to the ECM. | ○ | ○ | ○ | ○ |
Duration | 2 seconds or more | 2 seconds or more | 2 seconds or more | 2 seconds or more | |
Detection Logic | 1-trip detection logic | 1-trip detection logic | 1-trip detection logic | 1-trip detection logic |
HINT:
This DTC is stored when any of the above detection patterns is met.
MONITOR DESCRIPTION
The ECM assumes that the vehicle is being driven when the transmission counter gear speed is 300 rpm or more. If there is no speed signal from the combination meter despite this condition being met, the ECM interprets this as a malfunction in the speed signal circuit, then illuminates the MIL and stores a DTC.
MONITOR STRATEGY
Related DTCs | P0500: Vehicle speed sensor/Verify pulse input |
Required sensors/components (Main) | Vehicle speed sensor, Combination meter, Skid control ECU |
Required sensors/components (Sub) | Transmission revolution sensor (NT), ECT sensor |
Frequency of operation | Continuous |
Duration | 2 sec. |
MIL operation | Immediately |
Sequence operation | None |
TYPICAL ENABLING CONDITIONS
The monitor will run whenever the following DTCs are not stored | None |
Battery voltage | 8 V or more |
Engine switch | On (IG) |
Starter | OFF |
Intermediate shaft speed sensor revolution | 300 rpm or more |
Engine | Running |
Shift change is completed before starting next shift change operation | - |
R position switch | OFF |
D position switch | ON |
Park/neutral position switch (NSW) | OFF |
Pressure control solenoid circuit fail (P08C1, P08C2, P0962, P0963, P0966, P0967, P0970, P0971, P2720, P2721, P2814, P2815, P281D, P281E) (Pending + MIL) | Not detected |
Torque Converter Clutch Pressure Control Solenoid circuit fail (P2763, P2764) (Pending + MIL) | Not detected |
Torque Converter Clutch Solenoid circuit fail (P2769, P2770) (Pending + MIL) | Not detected |
ECM selected gear | 1st |
Turbine speed sensor revolution | 1450 rpm or more |
ECM selected gear | 2nd |
Turbine speed sensor revolution | 840 rpm or more |
ECM selected gear | 3rd |
Turbine speed sensor revolution | 540 rpm or more |
ECM selected gear | 4th |
Turbine speed sensor revolution | 400 rpm or more |
ECM selected gear | 5th |
Turbine speed sensor revolution | 330 rpm or more |
ECM selected gear | 6th |
Turbine speed sensor revolution | 300 rpm or more |
ECM selected gear | 7th |
Turbine speed sensor revolution | 300 rpm or more |
ECM selected gear | 8th |
Turbine speed sensor revolution | 300 rpm or more |
ECT | 20°C (68°F) or more |
ECT sensor circuit fail (P0117, P0118) (Pending + MIL) | Not detected |
Time after park/neutral position switch ON to OFF | 2 sec. or more |
Either of the following conditions is met | (1) or (2) |
(1) ECT | Less than 20°C (68°F) |
(2) ECT sensor circuit fail (P0117, P0118) (Pending + MIL) | Detected |
Time after park/neutral position switch ON to OFF | 30 sec. or more |
TYPICAL MALFUNCTION THRESHOLDS
Vehicle speed sensor signal | No signal |
CONFIRMATION DRIVING PATTERN
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
Click here
HINT:
[*1] : Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Techstream Display | Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
N/A |
|
HINT:
WIRING DIAGRAM
Refer to SFI system DTC P050031.
Click here
CAUTION / NOTICE / HINT
CAUTION:
NOTICE:
Click here
Click here
PROCEDURE
1. | READ VALUE USING TECHSTREAM (VEHICLE SPEED) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Transmission / Data List / Vehicle Speed.
(e) Drive the vehicle.
(f) In accordance with the display on the Techstream, read the Data List.
Powertrain > Transmission > Data List Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
---|---|---|---|---|
Vehicle Speed | Vehicle speed | Min.: 0 km/h (0 mph) Max.: 255 km/h (158 mph) | Actual vehicle speed |
|
Tester Display |
---|
Vehicle Speed |
OK:
Vehicle speed displayed on the Techstream and speedometer display are equal.
OK | CHECK FOR INTERMITTENT PROBLEMS |
|
2. | CHECK COMBINATION METER SYSTEM |
(a) Check the circuits that send vehicle speed signals to this system in the meter system.
Click here
(b) During inspection for the meter section, if there is an instruction that indicates to go back to inspections for each system, proceed to the next step.
|
3. | CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM) |
(a) Disconnect the G17 combination meter assembly connector.
(b) Disconnect the A25 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
G17-19 (+S) - A25-39 (SPD) | Always | Below 1 Ω |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. | REPLACE ECM |
(a) Replace the ECM.
Click here
NEXT | PERFORM REGISTRATION |