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HOMESERVICE MANUALSSUZUKI2005VERONA EXREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE GENERAL INFORMATION AND DIAGNOSISDIAGNOSTIC INFORMATION AND PROCEDURESDTC P0159 HO2S BANK 2 SLOW RESPONSEDTC TROUBLESHOOTING
2005 Suzuki Verona EX

DTC Troubleshooting

2005 Suzuki Verona EXSECTION DTC Troubleshooting
DIAGNOSIS PROCEDURE - DTC P0159 HO2S BANK 2 SLOW RESPONSE

Step Action Value(s) Yes No
1 Perform an On-Board Diagnostic (OBD) System Check.
Is the system check complete?		 - Go to Step 2. Go to "ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK ".
2
  1. Connect the scan tool to the data link connector (DLC).
  2. Run the engine until it reaches operating temperature.
  3. Check for the closed loop operation.

Does the scan tool indicate the closed loop?		 - Go to Step 3. Go to Step 4.
3
  1. Turn the ignition switch to LOCK.
  2. Review the Freeze Frame data and note the parameters.
  3. Operate the vehicle within the Freeze Frame conditions and Conditions for Setting the DTC.

Does the scan tool indicate the closed loop?		 - Go to Step 12. Go to Step 4.
4
  1. Disconnect the HO2S connector.
  2. Jumper the oxygen sensor connector terminal 1 to ground.
  3. Turn the ignition switch to ON.

Does the scan tool read the oxygen sensor signal voltage the specified valve?		 0.4 ~ 0.5 V Go to Step 5. Go to Step 8.
5 Check the oxygen sensor connector for malfunction terminals or poor connection and repair as necessary.
Is repair necessary?		 - Go to Step 12. Go to Step 6.
6
  1. Run the engine at idle.
  2. Remove the jumper wire.
  3. Measure the voltage between the oxygen sensor connector terminal 4 and ground.

Does the oxygen sensor voltage measure above the specified value?		 0.6 V Go to Step 7. Go to Step 11.
7
  1. Turn the ignition switch to LOCK.
  2. Measure the voltage between the HO2S connector terminal 4 and ground.

Does the oxygen sensor voltage measure above the specified value?		 0.3 V Go to Step 9. Go to Step 11.
8 Repair the wire or the connector between the HO2S terminal 1 and the engine control module (ECM) terminal 9 is open or a short to ground.
Is the repair complete?		 - Go to Step 11. Go to Step 9.
9 Repair the wire and the connector terminal between the oxygen sensor connector terminal 4 and the ECM connector terminal 94 is open or a short to ground.
Is the repair complete?		 - Go to Step 12. Go to Step 10.
10
  1. Turn the ignition switch to LOCK.
  2. Replace the ECM.
  3. Perform the diagnostic system check.

Is the repair complete?		 - System OK -
11 Replace the 02 sensor.
Is the repair complete?		 - Go to Step 12. -
12
  1. Clear any DTCs from the ECM.
  2. Perform the diagnostic system check.

Is the repair complete.		 - Go to Step 13. -
13 Check if any additional DTCs are set.
Are any DTCs displaced that have not been diagnosed?		 - Go to applicable DTC TABLE . System OK
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.