DESCRIPTION
The combination meter assembly communicates with the ECM via the CAN communication lines (CAN No. 1 Bus).
| DTC No. | DTC Detection Conditions | Trouble Areas |
|---|---|---|
| U0100 | When either of following conditions detected: Vehicle speed 5 km/h (3.1 mph) or more and IG voltage 10.5 V or more No communication with ECM continues for 3 seconds or more (No communication to ECM or skid control ECU continues for 60 seconds or more) | CAN communication system ECM |
DTC DETECTION CONDITION CHART
Scheme 1
The combination meter assembly communicates with the ABS and traction actuator assembly (skid control ECU) via the CAN communication system (CAN No. 1 Bus).
| DTC No. | DTC Detection Conditions | Trouble Areas |
|---|---|---|
| U0129 | When either of following conditions detected: 15 seconds have elapsed since engine started and IG voltage 10.5 V or more No communication with ABS and traction actuator (skid control ECU) continues for 3 seconds or more (No communication with ECM or skid control ECU continues for 60 seconds or more) | ABS and traction actuator (Skid control ECU) CAN communication system |
DTC DETECTION CONDITION CHART
Scheme 2
This circuit is the power source circuit for the meter. This circuit provides two types of power sources; one is a constant power source mainly used as a backup power source, and the other is a power source mainly used for signal transmission. The constant power source is mainly used as a backup power source of the meter CPU, however, it is also used for communication. If a voltage of 12 V is not applied to terminal IG+ when the engine switch is on (IG), the indicator will not operate.
Scheme 3
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- INSPECT COMBINATION METER ASSEMBLY Disconnect the E19 connector. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFICATION Tester Connection Condition Specified Condition E19-12 (E2) - Body ground Always Below 1 ohms E19-24 (ES) - Body ground Always Below 1 ohms Measure the voltage according to the value(s) in the table below. Standard voltage VOLTAGE SPECIFICATION Tester Connection Condition Specified Condition E19-13 (IG+) - Body ground Turn the engine switch on (IG) 10 to 14 V E19-1 (B2) - Body ground Always 10 to 14 V E19-2 (B) - Body ground Always 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE COMBINATION METER ASSEMBLY
The meter CPU receives vehicle speed signals from the skid control ECU via the CAN communication lines (CAN No. 1 Bus). The vehicle speed sensor detects the voltage that varies according to the vehicle speed. The skid control ECU supplies power to the vehicle speed sensor. The skid control ECU detects vehicle speed signals based on the pulses of the voltage.
Scheme 5
In this circuit, the meter CPU receives engine revolution signals from the ECM using the CAN communication lines (CAN No. 1 Bus). The meter CPU displays engine revolution data that is calculated based on the data received from the ECM.
Scheme 6
The meter CPU uses the fuel sender gauge assembly to determine the level of the fuel in the fuel tank. The resistance of the fuel sender gauge will vary between approximately 15 ohms with the float at the full position, and 410 ohms, with the float at the empty position. The meter outputs battery voltage through two 820 ohms resistors that are mounted in parallel inside the meter ECU. The meter CPU measures the voltage between the variable resistor in the fuel sender gauge and the two resistors mounted in parallel in the meter. Voltage measured at this point will vary as the float of the fuel sender gauge is moved. The highest voltage observed should be approximately half of battery voltage.
HINT
The fuel level warning light will come on when the fuel level is below 10.5 liters.
Scheme 7
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Scheme 9
- CHECK CAN COMMUNICATION SYSTEM Check if CAN communication DTC is output (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-283107-S06034118862008041700000) ). Result RESULT CHART Result Proceed to CAN communication DTC is not output A CAN communication DTC is output B (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-283107-S30957598272008041700000) ) B: GO TO 2 CAN COMMUNICATION SYSTEM A: Go to Next Step
- PERFORM ACTIVE TEST BY INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG). Turn the tester ON. Enter following menus: DIAGNOSIS / OBD/MOBD / METER/ACTIVE TEST. Check the operation by referring to the table below. METER: METER ACTIVE TEST LIST Tester Display Test Part Control Range Diagnostic Note FUEL GAUGE Fuel receiver gauge EMPTY, 1/2, FULL - OK: Needle indication is normal. NG: REPLACE COMBINATION METER ASSEMBLY OK: Go to Next Step
- READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Turn the engine switch on (IG). Turn the tester ON. Enter following menus: DIAGNOSIS / OBD/MOBD / METER/DATA LIST. Check the values by referring to the table below. METER: ENGINE DATA TEST LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note FUEL GAUGE Fuel input signal Min.: 0, Max.: 127.5 (L) Fuel gauge indicates (E): 7.5 (L) Fuel gauge indicates (1/2): 35.0 (L) Fuel gauge indicates (F): 62.9 (L) - OK: Fuel value signal displayed on the tester is almost the same as needle indication. NG: REPLACE COMBINATION METER ASSEMBLY OK: Go to Next Step
- CHECK HARNESS AND CONNECTOR (COMBINATION METER - FUEL SENDER GAUGE ASSEMBLY) Disconnect the E20 and L13 connectors. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFICATION Tester Connection Condition Specified Condition E20-16 (FE) - L13-2 Always Below 1 ohms E20-15 (FR) - L13-3 Always Below 1 ohms L13-2 - Body ground Always 10 kohms or higher E20-16 - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to Next Step
- INSPECT FUEL SENDER GAUGE ASSEMBLY Disconnect the fuel sender gauge connector. Remove the fuel sender gauge assembly. Check that the float moves smoothly between F and E. Measure the resistance between the terminals 2 (S) and 3 (FE) of the connector according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFICATION Float Level Resistance (ohms) F 13.5 to 16.5 Between E and F 13.5 to 414.5 (Gradually changes) E 405.5 to 414.5 NG: REPLACE FUEL SENDER GAUGE ASSEMBLY OK: Go to Next Step
- REPLACE COMBINATION METER ASSEMBLY Replace the combination meter assembly with a new one or a normal one. OK: The operation of the combination meter assembly returns to normal. NG: REPLACE ECM OK: END
- In this circuit, the meter CPU receives engine coolant temperature signals from the ECM using the CAN communication lines (CAN No. 1 Bus).
- The meter CPU displays engine coolant temperature that is calculated based on the data received from the ECM.
Scheme 10
The meter CPU receives signals for adjusting illumination on the meter this circuit. The meter CPU detects the illumination level selected by the user according to the position of the rheostat knob.
HINT
- This model is equipped with an Optitron meter, therefore the meter illuminates even in the daytime.
- The meter illumination level can be adjusted by turning the rheostat.
- The meter illumination dims when the light control switch is turned to the TAIL or HEAD position at night.
- Turning the rheostat knob fully upwards cancels the above dimmer control.
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- SYSTEM CHECK Turn the engine switch on (IG). Turn the light control rheostat knob fully upwards. Turn the light control rheostat knob fully downwards. Turn the light control rheostat knob fully upwards and light control switch is on TAIL/HEAD. Check the meter illumination. Result RESULT CHART Result Proceed to Meter illumination does not change when operating the light control rheostat knob A Dimmer cancel does not operate (Meter illumination does not dim). B B: Go to step 3 A: Go to Next Step
- READ VALUE OF INTELLIGENT TESTER (RHEOSTAT) Connect the intelligent tester to the DLC3. Turn the engine switch on (IG). Turn the tester ON. Enter the following menus: DIAGNOSIS / OBD/MOBD / METER/DATA LIST Check the values by referring to the table below. METER: ENGINE DATA TEST LIST Tester Display Measurement Item/Range Normal Condition Diagnostic Note RHEOSTAT Light control rheostat/Min.: 0%, Max.: 100% Light control rheostat switch is Dark (0%) --> Bright (100%) - OK: The value displayed on the tester gradually changes as the actual rheostat operation. NG: Go to step 4 OK: Go to Next Step
- READ VALUE OF INTELLIGENT TESTER (TAIL CANCEL SW) Connect the intelligent tester to the DLC3. Turn the engine switch on (IG). Turn the tester ON. Enter the following menus: DIAGNOSIS / OBD/MOBD / METER / DATA LIST. Check the values by referring to the table below. METER: METER REFERENCE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note TAIL CANCEL SW Tail cancel switch is OFF/ON OFF: Light control rheostat position is except above - ON: Light control rheostat turns fully upwards - OK: Condition displayed on the tester is the same as the actual rheostat position. NG: Go to step 6 OK: REPLACE COMBINATION METER ASSEMBLY
- INSPECT LIGHT CONTROL RHEOSTAT Remove the light control rheostat. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFICATION Tester Connection Condition Specified Condition E55-3 (T) - E55-4 (RV) Turn the rheostat knob fully upwards 8 kohms or higher E55-3 (T) - E55-4 (RV) Rheostat knob is between MIN. and MAX. The value changes gradually (Between below 1 to 8 kohms) E55-3 (T) - E55-4 (RV) Turn the rheostat knob fully downwards Below 1 ohms NG: REPLACE LIGHT CONTROL RHEOSTAT OK: Go to Next Step
- CHECK HARNESS AND CONNECTOR (COMBINATION METER - LIGHT CONTROL RHEOSTAT) Disconnect the E19 and E55 connectors. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFICATION Tester Connection Condition Specified Condition E19-6 (TR) - E55-4 (RV) Always Below 1 ohms E19-10 (E3) - E55-3 (T) Always Below 1 ohms E19-16 (TC) - E55-1 (TC) Always Below 1 ohms E55-1 (TC) - Body ground Always 10 kohms or higher E55-3 (T) - Body ground Always 10 kohms or higher E55-4 (RV) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE COMBINATION METER ASSEMBLY
- INSPECT LIGHT CONTROL RHEOSTAT Remove the light control rheostat with connector still connected. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFICATION Tester Connection Condition Specified Condition E55-1 (TC) - E55-3 (T) Turn the rheostat knob fully downwards Below 1 ohms E55-1 (TC) - E55-3 (T) Turn the rheostat knob fully upwards 8 kohms or higher NG: REPLACE LIGHT CONTROL RHEOSTAT OK: Go to Next Step
- CHECK HARNESS AND CONNECTOR (COMBINATION METER - LIGHT CONTROL RHEOSTAT) Disconnect the E19 and E55 connectors. Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFICATION Tester Connection Condition Specified Condition E55-1 (TC) - E19-16 (TC) Always Below 1 ohms E55-1 (TC) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE COMBINATION METER ASSEMBLY
In this circuit, the meter CPU receives auto dimmer signals from the main body ECU using the CAN communication lines (CAN MS Bus). When the meter CPU receives an auto dimmer signal, it dims the meter illumination. The main body ECU determines whether it is daytime, twilight, or nighttime based on the waveform transmitted from the automatic light control sensor. If the main body ECU determines that it is daytime, the ECU does not send auto dimmer signals. Therefore, the meter illumination (warning and indicator lights) will not dim even if the driver accidentally turns the light control switch to the TAIL or HEAD position in daytime.
HINT
When the meter illumination is always dark, there may be a malfunction in automatic light control sensor, main body ECU, CAN communication system, wire harness or connector, or combination meter assembly.
Scheme 16
In this circuit, the meter CPU receives auto dimmer signals from the main body ECU using the CAN communication lines (CAN MS Bus). When the meter CPU receives an auto dimmer signal, it dims the meter illumination. The main body ECU determines whether it is daytime, twilight, or nighttime based on the waveform transmitted from the automatic light control sensor. If the main body ECU determines that it is daytime, the ECU does not send auto dimmer signals. Therefore, the meter illumination (warning and indicator lights) will not dim even if the driver accidentally turns the light control switch to the TAIL or HEAD position in daytime.
HINT
When the meter illumination does not dim at night, the light control rheostat position is at the tail cancel position, or there may be a malfunction in automatic light control sensor, main body ECU, CAN communication system, wire harness or connector, or combination meter assembly.