2000 SUZUKI SWIFT Tcm

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-39
C4121 Throttle opening signal for TCM
(A/T)Indication
deflection
repeated
0 V and
10 – 14 VIgnition switch ON
22 Fuel level sensor (gauge)
(Vehicle with immobilizer indicator lamp)0 – 2 V Ignition switch ON
Fuel tank fully filled
4.5 – 7.5 V Ignition switch ON
Fuel tank emptied
23 Serial data for TCM 10 – 14 V
and 0 – 1 VIgnition switch ON
24 Blank–– TERMINAL
NO.CIRCUIT NORMAL
VOLTAGECONDITION
TERMINAL
NO.CIRCUIT NORMAL
VOLTAGECONDITION
G021 Malfunction indicator lamp 0 – 1 V Ignition switch ON
10 – 14 V When engine running
2 Vehicle speed sensor Indicator
deflection
repeated
0 V and
4 – 6 VIgnition switch ON
Front left tire turned slowly with front
right tire locked
3 Radiator fan control relay 10 – 14 V Ignition switch ON and Engine coolant
temp. : 100°C (212°F) or lower
0 – 1 V Ignition switch ON and Engine coolant
temp. : 102.5°C (216.5°F) or higher
4 Blank––
5 Data link connector
(K line of ISO9141)10 – 14 V Ignition switch ON
6 Ignition switch 10 – 14 V Ignition switch ON
7 Data link connector (SUZUKI serial
data line)4 – 6 V Ignition switch ON
8 Blank––
9 Stop lamp switch 0 V Ignition switch ON
Stop lamp switch OFF
10 – 14 V Ignition switch ON
Stop lamp switch ON
10 Sensor ground––
11 Blank––
12 Immobilizer indicator lamp 0 – 1 V Ignition switch ON
10 – 14 V When engine running
13 Electric load signal (–)0 – 2 V Ignition switch ON
Blower fan turned OFF
10 – 14 V Ignition switch ON
Blower fan turned ON
14 A/C evaporator temp. sensor––
15 Blank––
16 Tachometer (if equipped) 0 – 1 V Ignition switch ON

6-42 ENGINE GENERAL INFORMATION AND DIAGNOSIS
C4121 Stop lamp switch 0 V Ignition switch ON
Stop lamp switch OFF
10 – 14 V Ignition switch ON
Stop lamp switch ON
22 Vehicle speed sensor Indication
deflection
repeated
0 V and
10 – 14 VIgnition switch ON
Front left tire turned slowly with
front right tire locked
23–––
24––– TERMINAL
NO.CIRCUIT NORMAL
VOLTAGECONDITION
TERMINAL
NO.CIRCUIT NORMAL
VOLTAGECONDITION
G021 A/C evaporator temp. sensor––
2 R-range signal (A/T) 0 V Ignition switch ON
3–––
4–––
5 Engine coolant temp. and barometric
pressure signal for TCM (A/T)Indication
deflection
repeated
0 V and
10 – 14 VIgnition switch ON
6 D-range ID-up signal (A/T) 10 – 14 V Ignition switch ON
7 Data link connector (SUZUKI serial
data line)4 – 6 V Ignition switch ON
8Blank––
9 Malfunction indicator lamp 0 – 1 V Ignition switch ON
10 – 14 V When engine running
10–––
11 Data link connector
(K line of ISO9141)10 – 14 V Ignition switch ON
12 Blank––
13 Electric load signal (–)0 – 2 V Ignition switch ON
Blower fan turned OFF
10 – 14 V Ignition switch ON
Blower fan turned ON
14 Sensor ground––
15 Throttle opening signal for TCM (A/T) Indication
deflection
repeated
0 V and
10 – 14 VIgnition switch ON
16 Tachometer (if equipped) 0 – 1 V Ignition switch ON
17–––

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-45
COMPONENT LOCATION
1. TP sensor 9. Radiator fan control relay No.3 17. ECM
2. MAP sensor 10. EVAP canister purge valve 18. Monitor connector
3. IAC valve 11. ECT sensor 19. VSS
4. IAT sensor 12. Ignition coil with igniter 20. Knock sensor (if equipped)
5. Radiator fan control relay No.1 13. HO2S-1 (if equipped) 21. CMP sensor
6. Main relay 14. HO2S-2 (if equipped) 22. EGR valve (if equipped)
7. Fuel pump relay 15. CKP sensor✱ : This figure shows left-hand steering vehicle, these parts are
installed at the other side for right-hand steering vehicle.
8. Radiator fan control relay No.2 16. TCM
1
3
24
518
6 7
20
19
8
9 1617
21
15
131214
10
22
11

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-57
Fig. 3 for Step 4
DTC P0115 (DTC NO.19) ENGINE COOLANT TEMPERATURE (ECT) CIRCUIT
MALFUNCTION
WIRING DIAGRAM / CIRCUIT DESCRIPTION
C42-14
5V
ECM
LT GRN
ORN
YEL/GRN
C42-10
C42 (31P) C41 (24P) G02 (17P)1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21
22 23 24 25 26 28 27 29 30 315 6
1 2 3 4 5 6 7
11 12
9 10 11 13 12 14 15 16
16 171 2
7 8
13 14 3 4
9 10
15 17 188
19 20 21 22 23 24
DTC DETECTING CONDITION POSSIBLE CAUSE
Low engine coolant temperature (High voltage-High resis-
tance)
or
High engine coolant temperature (Low voltage-Low resis-
tance)“LT GRN” circuit open or shorted to power
“ORN” circuit open
ECT sensor malfunction
ECM malfunction
NOTE:
Before inspecting, be sure to check that coolant temp. meter in combination meter indicates normal
operating temperature (Engine is not overheating).
When this DTC and P1709 are stored together, also clear DTC stored in TCM after completion of
repair.
When DTC P0105 (No.11), P0110 (No.18), P0115 (No.19) and P0120 (No.13) are indicated together, it
is possible that “ORN” circuit open.

6-60 ENGINE GENERAL INFORMATION AND DIAGNOSIS
DTC P0120 (DTC NO.13) THROTTLE POSITION CIRCUIT MALFUNCTION
WIRING DIAGRAM / CIRCUIT DESCRIPTION
DTC CONFIRMATION PROCEDURE
1) Clear DTC, start engine and keep it at idle for 1 min.
2) Select “DTC” mode no scan tool and check DTC.
[A] : Case of TYPE A is shown (See NOTE) [B] : Case of TYPE B is shown (See NOTE)
DTC DETECTING CONDITION POSSIBLE CAUSE
Signal voltage high
or
Signal voltage low“ORN” circuit open
“GRY/BLU” circuit open or shorted to ground
“GRY/RED” circuit open or shorted to power or ground
TP sensor malfunction
ECM malfunction
C42-10
C42-22
5V5V
ECM
GRY/RED
GRY/BLU
ORN
C42 (31P) C41 (24P) G02 (17P)1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21
22 23 24 25 26 28 27 29 30 315 6
1 2 3 4 5 6 7
11 12
9 10 11 13 12 14 15 16
16 171 2
7 8
13 14 3 4
9 10
15 17 188
19 20 21 22 23 24
C42-16 [B] C41-3 [A]
NOTE:
For TYPE A and TYOE B, refer to NOTE in “ECM VOLTAGE VALUES TABLE” for applicable model.
When DTC P0105 (No.11), P0110 (No.18), P0115 (No.19) and P0120 (No.13) are indicated together, it
is possible that “ORN” or “GRY/RED” circuit is open.
When this DTC and P1700 are stored together, also clear DTC stored in TCM after completion of
repair.
When this DTC and DTC P0105 (No.11) are indicated together, it is possible that “GRY/RED” circuit
is open.

6-112 ENGINE GENERAL INFORMATION AND DIAGNOSIS
DTC P1600 SERIAL COMMUNICATION PROBLEM BETWEEN ECM AND TCM
WIRING DIAGRAM
CIRCUIT DESCRIPTION
The serial data line is pulled up to about 12 V by ECM and TCM transmits information to ECM through it by con-
trolling its grounding.
TCM constantly sends information while ignition switch is ON as to whether judgement was made or not with
respect to all detectable DTCs as well as whether or not abnormality exists after judgement.
DTC CONFIRMATION PROCEDURE
1) Turn ignition switch OFF.
2) Clear DTC with ignition switch ON.
3) Start engine and run it at idle for 1 min.
4) Select “DTC” mode on scan tool and check DTC.
INSPECTION
ECM
TCMIG1
BLK/WHT
12V
C42 (31P) C41 (24P) G02 (17P)1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21
22 23 24 25 26 28 27 29 30 315 6
1 2 3 4 5 6 7
11 12
9 10 11 13 12 14 15 16
16 171 2
7 8
13 14 3 4
9 10
15 17 188
19 20 21 22 23 24
C44-20
C41-23
DTC DETECTING CONDITION POSSIBLE CAUSE
No signal inputted from TCM to ECM or check sum
error while engine running“BLK/WHT” circuit open or short
TCM power or ground circuit open
TCM malfunction
ECM malfunction
Step Action Yes No
1Was “ENGINE DIAG. FLOW TABLE” per-
formed?Go to Step 2. Go to “ENGINE DIAG.
FLOW TABLE”.
2 Check Signal Voltage.
Check voltage between terminal C41-23 and
body ground with ignition switch ON.
Does it change between 0 – 12 V? See Fig. 1.Intermittent trouble or
faulty ECM or TCM.
Check for intermittent
trouble referring to “Inter-
mittent and poor connec-
tion” in Section 0A.Go to Step 3.

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-113
Fig. 1 for Step 2
Fig. 2 for Step 43 Is it about 12 V at Step 2?“BLK/WHT” wire open,
poor C44-20 connection
or TCM power or ground
circuit open. If wires and
connections are OK, sub-
stitute a known-good
TCM and recheck.Go to Step 4.
4 Check Signal Circuit.
1) Disconnect TCM coupler with ignition switch
OFF.
2) Check voltage between C44-20 terminal
and body ground with ignition switch ON.
See Fig. 2.
Is it about 12 V?Check TCM power and
ground circuit for open. If
OK, substitute a known-
good TCM and recheck.“BLK/WHT” wire shorted
to ground or poor C44-23
terminal connection.
If wire and connection are
OK, substitute a known-
good ECM and recheck. Step Action Yes No

6-114 ENGINE GENERAL INFORMATION AND DIAGNOSIS
DTC P1717 A/T DRIVE RANGE (PARK/NEUTRAL POSITION) SIGNAL CIRCUIT
MALFUNCTION
WIRING DIAGRAM / CIRCUIT DESCRIPTION
DTC CONFIRMATION PROCEDURE
1) Turn ignition switch OFF.
2) Clear DTC with ignition switch ON.
3) Start engine and shift selector lever to “D” range.
4) Increase vehicle speed to higher than 20 mph, 32 km/h and then stop vehicle.
5) Repeat above step 4) 9 times.
6) Shift selector lever to “2” range and repeat above step 4) and 5).
7) Shift selector lever to “L” range and repeat above step 4) and 5).
8) Check DTC in “DTC” mode and pending DTC in “ON BOARD TEST” or “PENDING DTC” mode.
1. From ignition switch 2. Transmission range switch
[A] : Case of TYPE A is shown (See NOTE) [B] : Case of TYPE B is shown (See NOTE)
TCMECMIG1
12V P
R
N
D
2
L
C42 (31P) C41 (24P) G02 (17P)1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21
22 23 24 25 26 28 27 29 30 315 6
1 2 3 4 5 6 7
11 12
9 10 11 13 12 14 15 16
16 171 2
7 8
13 14 3 4
9 10
15 17 188
19 20 21 22 23 24
IG11
C44-8
REDGRN/ORN1
2G02-6 [B] C41-14 [A]
C41-15 [A]
G02-2 [B] GRN RED [B]LT BLU [A]
NOTE:
For TYPE A and TYPE B, refer to NOTE in “ECM VOLTAGE VALUES TABLE” for applicable model.
DTC DETECTING CONDITION POSSIBLE CAUSE
“D” range signal not inputted (Park/Neutral position
signal inputted) to ECM while vehicle running
✱2 driving cycle detection logic, continuous monitor-
ing.“LT BLU” circuit open
Transmission range switch malfunction
“R”, “D”, “2” or “L” range signal circuit open
TCM power or ground circuit open
TCM malfunction
ECM malfunction
WARNING:
When performing a road test, select a place where there is no traffic or possibility of a traffic acci-
dent and be very careful during testing to avoid occurrence of an accident.
Road test should be carried out with 2 persons, a driver and a tester.