Chery Tiggo 5 (T21). Service manual - part 50

06–

42

06

a. Turn ignition switch to LOCK.
b. Check fuse EF39 and main relay.
c. Disconnect engine compartment fuse and relay box 

connector E-076.

d. Check wire harness between downstream oxygen sensor 

connector terminals and engine compartment fuse and 
relay box connector terminals.
Check for Open 

Check for Short

4

Check downstream oxygen sensor power supply circuit

E-076

E-043

1

2

3

4

A1

A2

A3

A4

A5

A6

A7

A8 A9 A10

-

+

RT21065012

Multimeter 

Connection

Condition

Specified 

Condition

E-043 (4) - E-076 

(A7)

Always

Continuity

Multimeter 

Connection

Condition

Specified 

Condition

E-043 (4) or 

E-076 (A7) - Body 

ground

Always

No continuity

E-043 (4) or 

E-076 (A7) - 

Battery positive

Always

No continuity

Replace fuse, main relay, wire harness or 
connector (downstream oxygen sensor - 
engine compartment fuse and relay box)

NG

OK

06–

43

06

a. Disconnect ECM connector E-033.
b. Check wire harness between downstream oxygen sensor 

connector terminals and ECM connector terminals.
Check for Open 

Check for Short

a. Measure resistance of downstream oxygen sensor.

5

Check downstream oxygen sensor heater control circuit

E-033

E-043

1

2

3

4

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

-

+

RT21065013

Multimeter 

Connection

Condition

Specified 

Condition

E-043 (3) - E-033 

(48)

Always

Continuity

Multimeter 

Connection

Condition

Specified 

Condition

E-043 (3) or 

E-033 (48) - Body 

ground

Always

No continuity

E-043 (3) or 
E-033 (48) - 

Battery positive

Always

No continuity

Repair or replace wire harness or 
connector (downstream oxygen  sensor - 
ECM)

6

Check downstream oxygen sensor heater

NG

OK

RT21090140

-

+

A

B

C

D

Multimeter 

Connection

Condition

Specified 

Condition

Terminal C - 

Terminal D

20°C

7 - 11 Ω

Terminal A - 

Terminal B

Always

No continuity 

Terminal A - 

Terminal C

Terminal A - 

Terminal D

Terminal B - 

Terminal C

Terminal B - 

Terminal D

Replace downstream oxygen sensor

NG

06–

44

06

a. Use X-431 3G diagnostic tester to read the ECM DTC.
b. Refer to "DTC Confirmation Procedure".
c. Check if DTC P0036-00, P0037-00, P0038-00 or P0054-00 still exists.

7

Check for DTCs

Replace ECM

System is operating normally. 
Reassemble vehicle and perform a road test to confirm that malfunction reported by customer has 
been repaired.

OK

NG

OK

06–

45

06

DTC

P0101-00 Mass or Volume Air Flow Circ. Range/Performance

DTC

P0102-00 Mass or Volume Air Flow Circ. Low Input

DTC

P0103-00 Mass or Volume Air Flow Circ. High Input