Suzuki GSX-R 1000 Service Manual: DTC “c44” (p0130/p0135): ho2 sensor
(ho2s) circuit malfunction
Detected condition and possible cause
Detected condition |
Possible cause |
C44/P0130 |
Ho2 sensor output voltage is not input to
ecm during engine operation and running
condition.
Sensor voltage > 1.0 V |
- Ho2 sensor circuit is open or shorted to the power
source.
- Heated circuit is open or shorted to ground.
- Battery voltage is not supply to the ho2 sensor.
|
C44/P0135 |
The heater can not operate so that heater
operation voltage is not supplied to the
oxygen heater circuit. |
Wiring diagram
Troubleshooting (when indicating c44/p0130:)
Caution
when using the multi-circuit tester, do not strongly touch the terminal
of the ecm coupler with a
needle pointed tester probe to prevent terminal damage. |
Note
after repairing the trouble, clear the dtc using sds tool. Refer to “use
of sds diagnosis reset procedures” . |
Step |
Action |
Yes |
No |
1 |
- Turn the ignition switch off.
- Lift and support the fuel tank. Refer to “fuel tank removal and
installation” in section 1g .
- Check the ho2 sensor coupler (1) for loose or poor
contacts.
If ok, then check the ho2 sensor lead wire continuity.
- Disconnect the ho2 sensor coupler.
- Check the continuity between the w/g wire and o/w
wire. If the sound is not heard from the tester, the circuit
condition is ok.
Special tool
(a): 09900–25008 (multi
circuit tester set)
Tester knob indication
continuity test ( )
- Disconnect the ecm coupler. Refer to “ecm removal and
installation” in section 1c .
- Check the continuity between the w/g wire and terminal
“34”. Also, check the continuity between the b/br wire
and terminal “35”.
Special tool
(a): 09900–25008 (multi
circuit tester set)
(b): 09900–25009
(needle-point probe set)
Tester knob indication
continuity ( )
Ecm couplers (harness side)
Is the continuity ok? |
Go to step 2. |
W/g wire shorted to the
power source, or w/g
or b/br wire open. |
2 |
- Connect the ecm coupler and ho2 sensor coupler.
- Warm up the engine enough.
- Insert the needle pointed probes to the lead wire coupler.
- Measure the ho2 sensor output voltage between the w/
g (b) wire and b/br (gr) wire, in idling condition.
Special tool
(a): 09900–25008 (multi
circuit tester set)
(b): 09900–25009
(needle-point probe set)
Tester knob indication
voltage ( )
Ho2 sensor output voltage at idle speed
0.3 V and less
((+) terminal: w/g (b) – (–) terminal: b/br (gr))
- If ok, then remove the air cleaner box and pinch the
pair hose (1) with a proper hose clamp.
- Measure the ho2 sensor output voltage while holding
the engine speed at 5 000 r/min.
Ho2 sensor output voltage at 5 000 r/min
0.6 V and more
((+) terminal: w/g – (–) terminal: b/br)
Is the voltage ok? |
- W/g or b/br wire
open or shorted to
the power source, or
poor “34” or “35”
connection.
- If wire and
connection are ok,
intermittent trouble or
faulty ecm.
- Recheck each
terminal and wire
harness for open
circuit and poor
connection.
- Replace the ecm with a known good one, and inspection it again.
Refer to “ecm removal and installation” in section 1c .
|
Replace the ho2
sensor with a new one.
Refer to “ho2 sensor removal and installation” in section 1c . |
Troubleshooting (when indicating c44/p0135:)
Note
after repairing the trouble, clear the dtc using sds tool. Refer to “use
of sds diagnosis reset procedures” . |
Step |
Action |
Yes |
No |
1 |
- Turn the ignition switch off.
- Lift and support the fuel tank. Refer to “fuel tank removal and
installation” in section 1g .
- Check the ho2 sensor coupler (1) for loose or poor
contacts.
If ok, then measure the ho2 sensor resistance.
- Disconnect the ho2 sensor coupler and measure the
resistance between terminals.
Caution
- temperature of the sensor affects resistance
value largely.
- Make sure that the sensor heater is in
atmospheric temperature.
|
Special tool
(a): 09900–25008 (multi
circuit tester set)
Tester knob indication
resistance (Ω)
Ho2 sensor heater resistance
6.7 – 9.5 Ω at 23 °c (73 °f)
(w – w)
Is the resistance ok? |
Go to step 2. |
Replace the ho2
sensor with a new one.
Refer to “ho2 sensor removal and installation” in section 1c . |
2 |
- Connect the ho2 sensor coupler.
- Insert the needle pointed probes to the lead wire coupler.
- Turn the ignition switch on and measure the heater
voltage between the w/b wire and ground.
If the tester voltage indicates the battery voltage, it is
good condition.
Note
battery voltage can be detected only before
starting the engine. |
Special tool
(a): 09900–25008 (multi
circuit tester set)
(b): 09900–25009
(needle-point probe set)
Tester knob indication
voltage ( )
Heater voltage
battery voltage
((+) terminal: w/b – (–) terminal: ground)
Is the voltage ok? |
- O/w or w/b wire
open or shorted to
ground, or poor “41”
connection.
- Recheck each
terminal and wire
harness for open
circuit and poor
connection.
- If wire and
connection are ok,
intermittent trouble or
faulty ecm.
- Replace the ecm with a known good one, and inspect it again.
Refer to “ecm removal and installation” in section 1c .
|
- Open or short circuit
in the w/b wire or o/
w wire.
- Loose or poor
contacts on the ecm
coupler or ho2
sensor coupler.
|
Detected condition and possible cause
Detected condition
Possible cause
Ignition switch signal is not input to the ecm.
Ignition system circuit open or short.
...
Detected condition
Possible cause
C46
The operation signal does not reach the
excv actuator.
Excva position sensor voltage low or
high
0.14 V ≤ Sensor v ...
Other materials:
Rear brake light switch inspection and adjustment
Check the rear brake light switch so that the brake light
will come on just before pressure is felt when the brake
pedal is depressed. If the brake light switch adjustment
is necessary, turn the adjuster nut (1) in or out while
holding the brake pedal.
Brake fluid level check
Refer to “bra ...
Specifications
Service data
Injector + fuel pump + fuel pressure regulator
Fuel
Tightening torque specifications
Note
the specified tightening torque is described in the following.
“Fuel pump components”
Reference: for the tightening torque of fastener not specified in this
se ...
Malfunction code and defective condition table
* : Immobilizer system equipped model only. ...