Chery Tiggo 5 (T21). Manual — part 78
06–
154
06
Check for Short
a. Use X-431 3G diagnostic tester to read the ECM DTC.
b. Refer to "DTC Confirmation Procedure".
c. Check if DTC P0645-00, P0646-00 or P0647-00 still exists.
Multimeter
Connection
Condition
Specified
Condition
E-033 (42) (MT)
or E-033 (58)
(CVT) or E-069
(F1) - Body
ground
Always
No continuity
E-033 (42) (MT)
or E-033 (58)
(CVT) or E-069
(F1) - Battery
positive
Always
No continuity
Repair or replace wire harness or
connector (ECM - engine compartment
fuse and relay box)
NG
4
Check for DTCs
OK
Replace ECM
NG
System is operating normally.
Reassemble vehicle and perform a road test to confirm that malfunction reported by customer has
been repaired.
OK
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06
DTC
P0688-00 EMC/PCM Power Relay Sense Circuit Open
ET21065015
BATTERY
ECM
MAIN
RELAY
10A
EF19
10A
EF17
10A
EF40
A2
F14
2-20
RL
A4
2-35
L
2-5
Br
A6
2-15
2-16
RR
R
86
87
85
30
ENGINE
COMPARTMENT
FUSE AND
RELAY BOX
IGNITION SWITCH
ON OR START
A1
A2
A3
A4
A5
A6
A7
A8 A9 A10
F12
F24
F11
F23
F10
F22
F9
F21
F8
F20
F7
F19
F6
F18
F5
F17
F4
F16
F3
F15
F2
F14
F1
F13
Gr
E-076
W
E-069
E-076
E-069
B
E-033
49 50 51
63
64
15
16
31
32
47
48
33 34 35
17 18 19
1
2
3
52 53 54 55 56 57 58 59 60 61 62
36 37 38 39 40 41 42 43 44 45 46
20 21 22 23 24 25 26 27 28 29 30
4
5
6
7
8
9 10 11 12 13 14
1-47
Br
Br
1-48
E-028
2-63
B
B
2-64
E-026
ECM-2
E-033
ECM-1
E-035
37 38 39 40 41 42 43 44 45 46
47
48
25 26 27 28 29 30 31 32 33 34
35
36
13 14 15 16 17 18 19 20 21 22
23
24
1
2
3
4
5
6
7
8
9 10
11
12
B
E-035
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06
DTC Confirmation Procedure
Confirm that battery voltage is over 12 V before performing the following procedures.
Turn ignition switch to LOCK.
Connect X-431 3G diagnostic tester (the latest software) to Data Link Connector (DLC).
Turn ignition switch to ON.
Use X-431 3G diagnostic tester to record and clear the DTCs stored in the ECM.
Select Read Code.
If the DTC is detected, the malfunction indicated by the DTC is current. Go to the diagnosis procedure - Step 1.
If DTC is not detected, the malfunction indicated by the DTC is intermittent (
).
Diagnosis Procedure
a. Turn ignition switch to LOCK.
b. Check ECM grounds E-026 and E-028 (
DTC Code
DTC Definition
DTC Detection
Condition
Possible Cause
P0688-00
EMC/PCM Power
Relay Sense Circuit
Open
Ignition switch ON
Main Relay
Wire harness or connector
ECM
CAUTION
When performing circuit diagnosis and test, always refer to the circuit diagram for specific circuit and
component information.
1
Check ECM ground point
Repair or replace ground wire harness or
ground point
NG
OK
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a. Unplug main relay and fuse EF40 from engine
compartment fuse and relay box.
b. Check if fuse EF40 is normal.
c. Check for continuity between terminals of main relay.
a. Measure voltage between terminals of main relay (engine
compartment fuse and relay box side) and body ground.
2
Check main relay and fuse
-
+
85
86
30
87
RT21060020
87
30
85
86
Multimeter
Connection
Specified Condition
30 - 87
No continuity
30 - 87
Continuity
(when battery voltage is applied
between terminals 85 and 86)
Replace main relay
NG
3
Check main relay circuit voltage
OK
RT21060030
-
+
V
30
85
86
87
Multimeter
Connection
Condition
Specified
Condition
Main relay
terminals 87 and
85 (engine
compartment fuse
and relay box
side) - Body
ground
Always
11 to 14 V
Repair or replace wire harness or
connector (main relay - battery)
NG
OK
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