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ELECTRICAL
179
ELECTRICAL
STEP FOR DIAGNOSING IMMOBILIZER CAN FAILURE:
1 Disconnect the battery before measuring the resistance
2 Measure the resistance in the diagnostic connector between following pins
CAN_H (6) & CAN_L
(14)
CAN_H(
6)
and
GND(5)
CAN_L(
14
) and
GND(5)
CAN_H (6) and
Vbatt (
EMS Pin
no. B1/B3/B5
)
CAN_L (14) and
Vbatt (
EMS Pin
no. B1/B3/B5
)
Value
Status
Value Status Value Status Value
Status Value
Status
2.1 60Ω-
70Ω
OK
>1KΩ
Range
OK
>1KΩ
Range
OK
>1KΩ
Range
OK
>1KΩ
Range
OK
2.2 0Ω-
20Ω
Short circuit
between
CAN_H and
CAN_L
0Ω-
20Ω
Short
circuit
between
CAN_H
and GND
0Ω-20Ω Short
circuit
between
CAN_L
and GND
0Ω-20Ω Short
circuit
between
CAN_H
and Vbatt
0Ω-20Ω Short
circuit
between
CAN_L
and Vbatt
2.3 110Ω-
130Ω
Either EMS or
BCM is not
connected or
open circuit
on main CAN
bus
-
-
-
-
-
-
-
-
2.4 >1KΩ
Range
EMS and
BCM both are
disconnected.
-
-
-
-
-
-
-
-
2.5 >1MΩ
Range
1. Check
continuity
between
CAN_H(6)
CAN_H(
B53
)
on EMS ECU
2. Check
continuity
between
CAN_L(
14
)
CAN_L(
B54
)
on EMS ECU
>1MΩ
Range
1. Check
continuity
between
CAN_H
(6) with
CAN_H
(
B53
) on
EMS
ECU.
2.Check
continuity
between
GND(5
)
with
GND(
B2/
B4/B6)
on EMS
ECU
>1MΩ
Range
1. Check
continuity
between
CAN_L
(
14
) with
CAN_L
(
B54
) on
EMS
ECU.
2. Check
continuity
between
GND(5)
GND(
B2/
B4/B6
)
on EMS
ECU
>1MΩ
Range
1. Check
continuity
between
CAN_H
(6)
CAN_H
(
B53
) on
EMS
ECU.
>1MΩ
Range
1. Check
continuity
between
CAN_L
(
14
) with
CAN_L
(
B54
) on
EMS
ECU.