TERMINALS OF ECU
1. CHECK TIRE PRESSURE WARNING ECU AND RECEIVER
(a) Disconnect the T14 tire pressure warning ECU and receiver connector and measure the voltage and resistance on the wire harness side.
*A |
w/o Wireless Door Lock System |
*B |
w/o Smart Key System with Wireless Door Lock System |
*C |
w/ Smart Key System |
*a |
Front view of wire harness connector (to Tire Pressure Warning ECU and Receiver) |
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
T14-1 (IG) - T14-12 (GND) |
LG - W-B |
IG power source |
Ignition switch ON |
10 to 16 V |
T14-12 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
T25-1 (IG) - T25-12 (GND) |
LG - W-B |
IG power source |
Ignition switch ON |
10 to 16 V |
T25-7 (+B) - T25-12 (GND |
BE - W-B |
Power supply (from battery) |
Always |
10 to 16 V |
T25-12 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
T24-1 (IG) - T24-12 (GND) |
LG - W-B |
IG power source |
Ignition switch ON |
10 to 16 V |
T24-7 (+B) - T24-12 (GND) |
BE - W-B |
Power supply (from battery) |
Always |
10 to 16 V |
T24-12 (GND) - Body ground*1 |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
(b) Connect the T14*1, T25*2, T24*3 tire pressure warning ECU and receiver connector.
(c) Measure the voltage and resistance according to the value(s) in the table below. If the result is not as specified, the ECU may be malfunctioning.
HINT:
Measure the values on the wire harness side while the connector is connected.
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
T14-3 (CLSW) - T14-12 (GND)*1 T25-3 (CLSW) - T25-12 (GND)*2 T24-3 (CLSW) - T24-12 (GND)*3 |
R - W-B |
Tire pressure warning reset switch |
|
Below 1.5 V |
|
8 to 15 V |
|||
T14-4 (RDA) - T14-12 (GND)*1 T25-4 (RDA) - T25-12 (GND)*2 T24-4 (RDA) - T24-12 (GND)*3 |
B - W-B |
Output signals |
Ignition switch ON |
Pulse generation (see waveform 1) |
T14-5 (PRG) - T14-12 (GND)*1 T25-5 (PRG) - T25-12 (GND)*2 T24-5 (PRG) - T24-12 (GND)*3 |
GR - W-B |
Input signals |
Ignition switch ON |
Pulse generation (see waveform 1) |
(d) Using an oscilloscope, check waveform 1.
Waveform 1:
Item |
Contents |
---|---|
Terminal |
T14-4 (RDA) - T14-12 (GND)*1 T25-4 (RDA) - T25-12 (GND)*2 T24-4 (RDA) - T24-12 (GND)*3 T14-5 (PRG) - T14-12 (GND)*1 T25-5 (PRG) - T25-12 (GND)*2 T24-5 (PRG) - T24-12 (GND)*3 |
Tool setting |
5 V/DIV., 5 ms./DIV. |
Vehicle condition |
Ignition switch ON |
*a |
Example |
*b |
GND |
HINT:
The waveform shown in the illustration is an example. If the tester displays a waveform that alternates between high and low, where high is a voltage that is between the IG power source voltage and a voltage 2.2 V lower than the IG power source voltage, and where low is a voltage of between 0 and 1.2 V, the ECU can be judged normal.
Radar Cruise Control Presence Determination Malfunction (Engine / HV) (C1A52)
DESCRIPTION
DTC C1A52 is stored when the ECM cannot recognize the millimeter wave radar sensor
assembly.
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
MIL
C1A52
Radar Cruise Control Presence Determin ...
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
Smart Key System (for Start Function)
DTC Code
Detection Item
See page
B2271
Ignition Hold Monitor Malfunction
B2274
ACC Monitor Malfunction
...
Removal
REMOVAL
PROCEDURE
1. REMOVE NO. 2 ENGINE UNDER COVER SUB-ASSEMBLY (w/ Off Road Package)
2. REMOVE NO. 1 ENGINE UNDER COVER SUB-ASSEMBLY
3. DRAIN ENGINE COOLANT
4. REMOVE V-BANK COVER SUB-ASSEMBLY
5. REMOVE RADIATOR SUPPORT TO FRAME SEAL
(a) Remove the 7 clips and radiator su ...