POWER ASSIST SYSTEMS POWER STEERING SYSTEM TERMINALS OF ECU
CHECK POWER STEERING ECU ASSEMBLY
1.625,2.021 2,2.25
0.375,0.229
2.271,2.021 2.646,2.25
0.375,0.229
3.375,2.021 3.75,2.25
0.375,0.229
4.833,2.021 5.208,2.25
0.375,0.229
1.698,2.052 2.177,2.375
0.479,0.323
10
false
E40
2.396,2.052 2.76,2.333
0.365,0.281
10
false
z7
3.5,2.052 3.75,2.333
0.25,0.281
10
false
z8
4.906,2.052 5.354,2.323
0.448,0.271
10
false
A25
0.219,0.094 0.375,0.271
0.156,0.177
10
false
*a
| *a | Component without harness connected
(Power Steering ECU Assembly) |
- | - |
a.
Measure the voltage and resistance according to the value(s) in the table below.
- NOTICE:
- ·
Check if the power steering ECU assembly connectors are securely connected by pulling on them from the backside.
·If the EPS warning light is illuminated due to a malfunction, the fail-safe function may cause the voltage of the power steering ECU's terminals to become 0 V.
| Terminals No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| E40-1 (IG) - Body ground | L - Body ground | IG power source voltage | Ignition switch ON | 8 to 16 V |
| E40-2 (SPD) - A25-2 (PGND) | V - W-B | Vehicle speed signal | Driving at approx. 20 km/h (12 mph) | Pulse generation
(See waveform 1) |
| E40-6 (TS) - Body ground | SB - Body ground | Test mode signal | Always | 9 to 16 V |
| E40-7 (CANH) - E40-8 (CANL) | GR - W | CAN communication line | Ignition switch off | 54 to 69 Ω |
| z7-1 (TRQ2) - z7-2 (TRQG) | Y - B | Torque sensor 2 input signal | Engine running and steering wheel not being turned (without load) | 2.3 to 2.7 V |
| Engine running and steering wheel being turned to right with vehicle stopped | 1.2 to 2.5 V | |||
| Engine running and steering wheel being turned to left with vehicle stopped | 2.5 to 3.8 V | |||
| z7-2 (TRQG) - Body ground | B - Body ground | Torque sensor ground | Always | Below 1 Ω |
| z7-8 (TRQV) - z7-2 (TRQG) | R - B | Torque sensor power source | Ignition switch ON | 4.5 to 5.5 V |
| z7-9 (TRQ1) - z7-2 (TRQG) | W - B | Torque sensor 1 input signal | Engine running and steering wheel not being turned (without load) | 2.3 to 2.7 V |
| Engine running and steering wheel being turned to right with vehicle stopped | 2.5 to 3.8 V | |||
| Engine running and steering wheel being turned to left with vehicle stopped | 1.2 to 2.5 V | |||
| z8-1 (M1) - Body ground | R - Body ground | Power steering motor assembly output signal 1 | Engine running and steering wheel being turned to right | 9 to 16 V |
| Engine running and steering wheel being turned to left | 6 to 8 V | |||
| z8-2 (M2) - Body ground | B - Body ground | Power steering motor assembly output signal 2 | Engine running and steering wheel being turned to right | 6 to 8 V |
| Engine running and steering wheel being turned to left | 9 to 16 V | |||
| A25-1 (PIG) - Body ground | L - Body ground | Power steering motor assembly power supply input signal | Always | 9 to 16 V |
| A25-2 (PGND) - Body ground | W-B - Body ground | Power ground | Always | Below 1 Ω |
If the result is not as specified, the ECU may have a malfunction.
b.
2.698,0.115 3.313,0.396
0.615,0.281
10
false
5 V/DIV.
1.229,1.99 2.927,2.167
1.698,0.177
10
false
20 ms./DIV.
2.854,1.229 3.313,1.427
0.458,0.198
10
false
GND
Waveform 1 (Reference): Using an oscilloscope:
| Item | Condition |
|---|---|
| Tool setting | 5 V/DIV., 20 ms./DIV. |
| Vehicle condition | Driving at approx. 20 km/h (12 mph) |