4.
After erase DTC, keep the vehicle condition within "the enable conditions"
(Refer to "DTC Detecting Condition" table)
All 13 units which consists of the Body Electrical Control System are linked by CAN*¹ line.
They are IPM(Inter Panel Module), FAM(Front Area Module), PDM(Power Distribution Module), DDM(Drive Door Module), ADM(Assist Door Module), ECW(Electronic Control Wiper), CLU(Cluster), MFSW(Multi Function Switch), PSM(Power Seat Module), SCM(Steering Control Module), PTM(Power Trunk Lid Module), FBWS(Front Back Warning System), DATC(Dual Auto Temperature Control Module).
*¹ CAN (Controller Area Network) : CAN is serial bus communication type which links not only communication system but also control units each other.
*² LIN (Local Interconnect Network) : LIN is serial communication type which is used in electrical control system. (This is less expensive.)
Pattern | Status | Communication is normal but DTC set if IPM detects 7 error status as follows. ① Short to battery in CAN High circuit ② Short to ground in CAN High circuit ③ Short to battery in CAN Low circuit ④ Short to ground in CAN Low circuit ⑤ Short between CAN High and Low circuit ⑥ Open or Poor connection in CAN Low circuit ⑦ Open or Poor connection in CAN High circuit |
1 | Open in CAN High circuit | |
2 | Open in CAN Low circuit | |
3 | Short to battery in CAN High circuit | |
4 | Short to battery in CAN Low circuit | |
5 | Short to ground in CAN High circuit | |
6 | Short to ground in CAN Low circuit | |
7 | Short between CAN High and Low circuit |
Item | Detecting Condition | Possible Cause | ||
DTC Strategy | ● CAN communication status | ● Short to battery / ground in CAN high circuit ● Short to battery / ground in CAN low circuit ● Short between CAN high and CAN low circuit ● Open or poor connection in CAN high and low circuit ● Faulty IPM | ||
Enable Conditions | ● IG "ON" ● Engine "START" ● B/T voltage engerzied to IPM | |||
Threshold Value | CAN high | 0 V | Short to ground | |
B+ V | Short to battery | |||
CAN low | 0 V | Short to ground | ||
B+ V | Short to battery | |||
Diagnostic Time | ● Failure has been continued for 2sec. | |||
DTC Erasing Time | ● DTC is erased immediately after trouble fixed (In case of the past error, perform DTC erasing procedure.) | |||
Fig 1) Signal waveform of CAN Low and HIGH
Fig 2) CAN BUS VOLTAGE LEVEL (LOW SPEED CAN)
Connect GDS.
IG "ON" and engine "OFF".
Select "DTC Analysis" mode.
After erase DTC, keep the vehicle condition within "the enable conditions"
(Refer to "DTC Detecting Condition" table)
Is the same DTC occurred again?
 | ▶ Go to next procedure. |
 | ▶ Fault is intermittent caused by poor contact in the sensor's and/or IPM's connector or was repaired and IPM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure. |
Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
| ▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure. |
| ▶ Go to " Signal Circuit Inpsection " procedure. |
IG "ON" & ENG "OFF".
Connect GDS and select Scope meter fucntion.
Measure signal waveform of IPM CAN High line.
Specification : Refer to signal waveform and data
Is the measured signal waveform of CAN high circuit normal ?
| ▶ Go to next procedure |
| ▶ Check short to battery / ground in CAN high circuit, and repair or replace as necessary. Go to "Verification of Vehicle Repair" procedure. |
IG "ON" & ENG "OFF"
Connect GDS and select Scope meter fucntion.
Measure signal waveform of IPM CAN Low line.
Specification : Refer to signal waveform and data
Is the measured signal waveform of CAN low circuit normal ?
| ▶ Go to next procedure. |
| ▶ Check short to battery / ground in CAN low circuit and, repair or replace as necessary. And then, go to 'Verification of Vehicle Repair" procedure. |
Connect GDS.
IG "ON" and engine "OFF".
Select "DTC Analysis" mode.
Disconnect CAN communication units one by one and monitor DTC to find the cause.
*CAN communication units : IPM(Inter Panel Module), FAM(Front Area Module), PDM(Power Distribution Module), DDM(Drive Door Module), ADM(Assist Door Module), CLU(Cluster), PSM(Power Seat Module), SCM(Steering Control Module), RAM(Rear Area Module), SMK(Smart Key).
Is the code erased?
| ▶ Substitute with a known - good unit and check for proper operation. If the problem is corrected, replace the unit and go to "Verification of Vehicle Repair" procedure. |
| ▶ Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure. |
After a repair, it is essential to verify that the fault has been corrected.
Connect scan tool and select "DTC Analysis" mode.
Clear the DTCs and Operate the vehicle within DTC Enable conditions in General information.
Is any DTC outputted again?
| ▶ Go to the applicable troubleshooting procedure. |
| ▶ System performing to specification at this time. |
