2000 SUZUKI SWIFT turn signal

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 6-73
6) Repeat above steps 5) 4 times.
7) Increase vehicle speed to about 50 mph (80 km/h) in 3rd gear or 2 range.
8) Release accelerator pedal and with engine brake applied, keep vehicle coasting (fuel cut condition) for
10sec. or more.
9) Stop vehicle (don’t turn ignition switch OFF) and run engine at idle for 2 min.
After this step 9), if “Oxygen Sensor Monitoring TEST COMPLETED” is displayed in “READINESS TESTS”
mode and DTC is not displayed in “DTC” mode, confirmation test is completed.
If “TEST NOT COMPLTD” is still being displayed, proceed to next step 10).
10) Drive vehicle under usual driving condition for 10 min. (or vehicle is at a stop and run engine at idle for 10
min. or longer)
11) Stop vehicle (don’t turn ignition switch OFF). Confirm test results according to “Test Result Confirmation
Flow Table” in “DTC CONFIRMATION PROCEDURE” of DTC P0420.
INSPECTION
Usual driving : Driving at 30 – 40 mph, 50 – 60 km/h including short stop according to traffic signal. (under driving condition other than high-load, high-engine
speed, rapid accelerating and decelerating)
Step Action Yes No
1Was “ENGINE DIAG. FLOW TABLE” per-
formed?Go to Step 2. Go to “ENGINE DIAG.
FLOW TABLE”.
2 Check Exhaust System for leakage, loose con-
nection and damage.
Is it good condition?Go to Step 3. Repair or replace.
3 Check HO2S-2 and Its Circuit.
Was HO2S-2 output voltage indicated on scan
tool in step 3) of DTC confirmation test less
than 1.275 V?Go to Step 4.“BRN”, “YEL” or “ORN”
circuit short to power sup-
ply circuit or HO2S-2 mal-
function.
4 Check Short Term Fuel Trim.
Did short term fuel trim very within – 20 – + 20%
range in step 3) of DTC confirmation test?Check “BRN”, “YEL” or
“ORN” wire for open and
short, and connection for
poor connection. If wire
and connection are OK,
replace HO2S-2.Check fuel system. Go to
DTC P0171/P0172 Diag.
Flow Table.

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-89
INSPECTION
Step Action Yes No
1Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE DIAG.
FLOW TABLE”.
2 Check CKP Sensor and Connector for proper
installation.
Is CKP sensor installed properly and connector
connected securely?Go to Step 3. Correct.
3 Check Wire Harness and Connection.
1) Disconnect connector from CKP sensor.
2) Check for proper connection to CKP sensor at
each terminal.
3) If OK, turn ignition switch ON and check for
voltage at each terminal of sensor connector
disconnected. See Fig. 1.
Terminal “B+” : 10 – 14 V
Terminal “Vout” : 4 – 5 V
Terminal “GND” : – 0 V
Is check result satisfactory?Go to Step 5. Go to Step 4.
4 Was terminal “Vout” voltage out of specification in
Step 3 check?“YEL/BLK” wire open,
short or poor connection.
If wire and connection are
OK, substitute a known-
good ECM and recheck.“BLK/RED” or “BLK/
ORN” wire open, short
or poor connection.
5 Check Ground Circuit for open.
1) Turn ignition switch OFF.
2) Check for continuity between “GND” terminal
of CKP sensor connector and engine ground.
Is continuity indicated?Go to Step 6.“BLK/ORN” wire open
or poor ground con-
nection.
6 Check CKP Sensor for operation.
1) Remove CKP sensor from sensor case.
2) Remove metal particles on end face of CKP
sensor, if any.
3) Connect each connector to ECM and CKP
sensor.
4) Turn ignition switch ON.
5) Check for voltage at terminal C42-23 of con-
nector connected to ECM by passing magnetic
substance (iron) while keeping approximately
1 mm (0.03 in.) gap with respect to end face of
CKP sensor. See Fig. 2 and 3.
Does voltage vary from low (0 –1 V) to high (4 – 5
V) or from high to low?Go to Step 7. Replace CKP sensor.
7 Check Signal Rotor for the following. See Fig. 4.
Damage
No foreign material attached
Is it in good condition?Intermittent trouble or
faulty ECM.
Check for intermittent
referring to “Intermittent
and Poor Connection” in
Section 0A.Clean rotor teeth or
replace CMP sensor.

6-92 ENGINE GENERAL INFORMATION AND DIAGNOSIS
INSPECTION
Step Action Yes No
1Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE
DIAG.
FLOW TABLE”.
2 Check CMP Sensor and connector for proper installa-
tion.
Is CMP sensor installed properly and connector con-
nected securely?Go to Step 3. Correct.
3 Check Wire Harness and Connection.
1) Disconnect connector from CMP sensor.
2) Check for proper connection to CMP sensor at
each terminal.
3) If OK, turn ignition switch ON and check for volt-
age at each terminal of sensor connector discon-
nected. See Fig. 1.
Terminal “B+” : 10 – 14 V
Terminal “Vout” : 4 – 5 V
Terminal “GND” : 0 V
Is check result satisfactory?Go to Step 5. Go to Step 4.
4Was terminal “Vout” voltage out of specification in
Step 3 check?“RED/YEL” wire open,
short or poor connection.
If wire and connection
are OK, substitute a
known-good ECM and
recheck.“BLK/RED” or “BLK/
ORN” wire open,
short or poor con-
nection.
5 Check Ground Circuit for open.
1) Turn ignition switch OFF.
2) Check for continuity between “GND” terminal of
CMP sensor connector and engine ground.
Is continuity indicated?Go to Step 6.“BLK/ORN” wire
open or poor ground
connection.
6 Check CMP Sensor for operation.
1) Remove CMP sensor from sensor case.
2) Remove metal particles on end face of CMP sen-
sor, if any.
3) Connect each connector to ECM and CMP sensor.
4) Turn ignition switch ON.
5) Check for voltage at terminal C42-11 of connector
connected to ECM by passing magnetic sub-
stance (iron) while keeping approximately 1 mm
(0.03 in.) gap with respect to end face of CMP
sensor. See Fig. 2 and 3.
Does voltage vary from low (0 – 1 V) to high (4 – 5 V)
or from high to low?Go to Step 7. Replace CMP sen-
sor.
7 Check Signal Rotor for the following.
See Fig. 4.
Damage
No foreign material attached
Is it in good condition?Intermittent trouble or
faulty ECM.
Check for intermittent
referring to “Intermittent
and Poor Connection” in
Section 0A.Clean rotor teeth or
replace CMP sensor.

6-104 ENGINE GENERAL INFORMATION AND DIAGNOSIS
Fig. 1 for Step 53 Check Vehicle Speed Signal.
Is vehicle speed displayed on scan tool in step
2) and 3) of DTC confirmation procedure?Intermittent trouble or
faulty ECM.
Check for intermittent
referring to “Intermittent
and Poor Connection” in
Section 0A.Go to Step 4.
4 Check VSS Signal Circuit.
1) Turn ignition switch to OFF position.
2) Disconnect combination meter connectors.
Refer to Section 8.
3) Disconnect P/S control module connector (if
equipped).
4) Turn ignition switch to ON position, without
running engine.
5) Measure voltage from terminal “a” of VSS
connector to ground.
Is voltage within 4 – 5 V?Faulty speedometer.
Faulty P/S control mod-
ule.
Faulty multi information
display.“PPL” wire open or short.
Poor connection of ECM
connector terminal.
If OK, substitute a known-
good ECM and recheck.
5 Check VSS Power Supply.
1) With ignition switch at OFF position, discon-
nect VSS connector.
2) Turn ignition switch to ON position, without
running engine.
3) Measure voltage from terminal “b” to “c” of
VSS connector. See Fig. 1.
Is voltage within 10 – 14 V?Go to Step 6.“BLK/RED” or “BLK/ORN”
wire open or short.
6 Check VSS Signal Circuit.
1) Measure voltage from terminal “a” of VSS
connector to ground.
Is voltage more than 4 V?Go to Step 7.“PPL” wire open or short.
Poor connection of ECM
connector terminal.
If OK, substitute a known-
good ECM and recheck.
7 Check Signal Rotor.
1) Remove VSS.
2) Visually inspect VSS sensor signal rotor for
damage.
Was any damage found?Faulty VSS signal rotor. Poor connection of VSS
connector terminal.
If OK, substitute a known-
good VSS and recheck. Step Action Yes No

ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-105
Fig. 2 for Step 4 and Step 6
DTC P0505 (DTC NO.26) IDLE CONTROL SYSTEM MALFUNCTION
CIRCUIT DESCRIPTION
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) Check DTC and pending DTC.
1. Ignition switch 3. Main relay
2. Battery 4. IAC valve
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
2
13 4
ECM
C42-6
C41-5
C41-6
C41-10GRN/RED
BLKBLK/RED
BRN/WHT
BLK/RED
DTC DETECTING CONDITION POSSIBLE CAUSE
No closed signal to IAC valve is detected after
engine start.
✱2 driving cycle detection logic, continuous monitor-
ing.“BLK/RED”, “GRN/RED” or “BLK” circuit open or
short
IAC valve malfunction
ECM malfunction

6-110 ENGINE GENERAL INFORMATION AND DIAGNOSIS
DTC P1500 ENGINE STARTER SIGNAL CIRCUIT MALFUNCTION
CIRCUIT DESCRIPTION
DTC CONFIRMATION PROCEDURE
1) Turn ignition switch OFF.
2) Clear DTC with ignition switch ON, crank engine and run it at idle for 3 min.
3) Check pending DTC in “ON BOARD TEST” or “PENDING DTC” mode and DTC in “DTC” mode.
INSPECTION
1. Ignition switch 2. Transmission range switch (A/T) 3. Starter motor
[A] : Case of TYPE A is shown (See NOTE) [B] : Case of TYPE B is shown (See NOTE)
321
BLK/YEL
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
ECM
C41-7 [A]
C41-20 [B]
NOTE:
For TYPE A and TYPE B, refer to NOTE in “ECM VOLTAGE VALUES TABLE” for applicable model.
DTC DETECTING CONDITION POSSIBLE CAUSE
Low voltage at terminal C41-7 (Case of TYPE A. See
NOTE) or C41-20 (Case of TYPE B. See NOTE) when
cranking engine or
High voltage at terminal C41-7 (Case of TYPE A. See
NOTE) or C41-20 (Case of TYPE B. See NOTE) after
starting engine.
✱2 driving cycle detection logic, continuous monitoring.“BLK/YEL” circuit open
ECM malfunction
Step Action Yes No
1Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE DIAG.
FLOW TABLE”.
2 Check Terminal Voltage.
1) Check for voltage at terminal C41-7 (Case of
TYPE A. See NOTE) or C41-20 (Case of
TYPE B. See NOTE) of ECM connector con-
nected, under following condition.
While engine cranking : 6 – 10 V
After starting engine : 0 V
Is voltage as specified?Poor C41-7 (Case of TYPE A. See
NOTE) or C41-20 (Case of TYPE B.
See NOTE)
connection or intermittent trouble.
Check for intermittent referring to
“Intermittent and Poor Connection”
in Section 0A.
If wire and connections are OK,
substitute a known-good ECM and
recheck.“BLK/YEL” circuit 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.