Circuit Inspection
| Module Inspection | ||||||
|---|---|---|---|---|---|---|
| Inspection Item | Inspection Condition | (+) Probe | (-) Probe | Specification | ||
| Connector | Terminal | Connector | Terminal | |||
| Voltage inspection (TCM ←→ Chassis ground) |
|
TCM connector | 17, 65, 66 (Memory power) | Chassis ground | - | B+ |
| TCM connector | 3 (ON/START Input) | Chassis ground | - | B+ | ||
| Voltage inspection (PCM ←→ Chassis ground) |
|
PCM connector | 64, 85 (Memory power) | Chassis ground | - | B+ |
| Open in circuit inspection (TCM ←→ Chassis ground) |
|
TCM connector | 57, 58, 61 (ground) | Chassis ground | - | Approx. below 1Ω |
| Open in circuit inspection (PCM ←→ Chassis ground) |
|
PCM connector | 45, 46 (ground) | Chassis ground | Approx. below 1Ω | |
Good
- Go to "CAN Communication Circuit Inspection (P-CAN)" procedure.
No Good
- Repair open or short in circuit and perform the "VERIFICATION OF REPAIR " procedure.
| CAN Communication Circuit Inspection (P-CAN) | ||||||
|---|---|---|---|---|---|---|
| Inspection Item | Inspection Condition | (+) Probe | (-) Probe | Specification | ||
| Connector | Terminal | Connector | Terminal | |||
| Resistance inspection (ECM, ICU) |
|
ECM (component side) | 56 (P-CAN high) | ECM (component side) | 57 (P-CAN low) | Approx. below 120Ω |
| ICU (component side) | 19 (P-CAN high) | ICU (component side) | 20 (P-CAN low) | Approx. below 120Ω | ||
| Open in circuit inspection (TCM ←→ ICU) |
|
TCM connector | 44 (P-CAN high) | ICU connector | 19 (P-CAN high) | Approx. below 1Ω |
| TCM connector | 45 (P-CAN low) | ICU connector | 20 (P-CAN low) | Approx. below 1Ω | ||
| Short in circuit inspection (TCM ←→ Chassis ground) |
|
TCM connector | 44 (P-CAN high) | Chassis ground | - | ∞ (infinity)Ω |
| TCM connector | 45 (P-CAN low) | Chassis ground | - | ∞ (infinity)Ω | ||
| Short in circuit inspection (PCM ←→ Chassis ground) |
|
PCM connector | 77 (P-CAN high) | Chassis ground | - | ∞ (infinity)Ω |
| PCM connector | 60 (P-CAN low) | Chassis ground | - | ∞ (infinity)Ω | ||
| P-CAN oscilloscope (TCM) |
|
TCM connector | 44 (P-CAN high) | Chassis ground | - | Fig.1 to 6 |
| TCM connector | 45 (P-CAN low) | Chassis ground | - | |||
| P-CAN oscilloscope (PCM) |
|
PCM connector | 77 (P-CAN high) | Chassis ground | - | Fig.1 to 6 |
| PCM connector | 60 (P-CAN low) | Chassis ground | - | |||
Information
It is important to check CAN high and low at the same time to check the waveform of the CAN communication line. The CAN signal is in a bus idle state based on 2.5V (digital "1"), the high signal rises to 3.5V, the low signal falls to 1.5V, and the voltage difference between the high and low signals is "0" when 2V occurs. Is detected. In addition, it monitors whether the high and low signals have opposite voltages based on 2.5V like the waveform on the left, and monitors whether the current CAN signal is transmitted normally.
In CAN communication, a continuous "0" signal of 6 bits or more means occurrence of an error. 1 bit can be easily determined by obtaining the time when "SOF" (Start Of Frame), indicating the start of the frame, occurs. Check if the "0" signal of 6 bits or more occurs continuously during CAN communication waveform check.
- Reference voltage about 2.5V. (high: 2.5V → 3.5V rise, low: 2.5V → 1.5V drop)
- Idle (2.5V) section of a certain period.
- Constant data frame time.
- High and low symmetrical frame shape.
Good
- Go to "CAN Communication Circuit Inspection (C-CAN)" procedure.
No Good
- Check for a short circuit between the wiring and the chassis ground.
- Perform repair or replacement as necessary and perform the "VERIFICATION OF REPAIR " procedure.
| CAN Communication Circuit Inspection (C-CAN) | ||||||
|---|---|---|---|---|---|---|
| Inspection Item | Inspection Condition | (+) Probe | (-) Probe | Specification | ||
| Connector | Terminal | Connector | Terminal | |||
| Resistance inspection (CLU, ICU) |
|
CLU (component side) | 35 (C-CAN high) | CLU (component side) | 34 (C-CAN low) | Approx. below 120Ω |
| ICU (component side) | 9 (C-CAN high) | ICU (component side) | 10 (C-CAN low) | Approx. below 120Ω | ||
| Open in circuit inspection (CLU ←→ ICU) |
|
CLU connector | 32 (C-CAN high) | ICU connector | 9 (C-CAN high) | Approx. below 1Ω |
| CLU connector | 33 (C-CAN low) | ICU connector | 10 (C-CAN low) | Approx. below 1Ω | ||
| C-CAN oscilloscope (CLU) |
|
CLU connector | 32 (C-CAN high) | Chassis ground | - | Fig.1 to 6 |
| CLU connector | 33 (C-CAN low) | Chassis ground | - | |||
Information
It is important to check CAN high and low at the same time to check the waveform of the CAN communication line. The CAN signal is in a bus idle state based on 2.5V (digital "1"), the high signal rises to 3.5V, the low signal falls to 1.5V, and the voltage difference between the high and low signals is "0" when 2V occurs. Is detected. In addition, it monitors whether the high and low signals have opposite voltages based on 2.5V like the waveform on the left, and monitors whether the current CAN signal is transmitted normally.
In CAN communication, a continuous "0" signal of 6 bits or more means occurrence of an error. 1 bit can be easily determined by obtaining the time when "SOF" (Start Of Frame), indicating the start of the frame, occurs. Check if the "0" signal of 6 bits or more occurs continuously during CAN communication waveform check.
- Reference voltage about 2.5V. (high: 2.5V → 3.5V rise, low: 2.5V → 1.5V drop)
- Idle (2.5V) section of a certain period.
- Constant data frame time.
- High and low symmetrical frame shape.
Good
- Fault might be intermittent and caused either by poor contact in connectors or wiring harness, or it has been repaired and control module memory is not cleared yet. Thoroughly check terminal of battery, all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.
- Repair or replace as necessary and then Go to "VERIFICATION OF REPAIR " procedure.
* In case of replacing the component, perform following "Vehicle S/W Management" procedure.
No Good
- Repair open or short in circuit and then Go to "VERIFICATION OF REPAIR " procedure.