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DTC P0726: Engine Speed Input Circuit Range/Performance: Troubleshooting

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2008 Suzuki Reno, 2008 Suzuki Forenza, 2007 Suzuki Reno, 2007 Suzuki Forenza, and 2006 Suzuki Reno. However, it is still accessible from the selected car via links, so may be relevant.
TROUBLESHOOTING REFERENCE CHART

Step Action Value(s) Yes No
1 Perform an On-Board Diagnostic (OBD II) System Check.
Is the check completed?		 - Go to Step 2 Go to ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK
2
  1. Install the scan tool.
  2. Turn the ignition ON and record then clear DTC(s), then turn the ignition OFF.
  3. Observe the engine speed on the scan tool.

Is the speed within the values shown?		 Engine speed 0 - 7,000 RPM Go to DIAGNOSTIC AIDS Go to Step 3
3
  1. Turn the ignition OFF.
  2. Disconnect the TCM wiring connector and ECM wiring connector.
  3. Measure the resistance between terminal A8 of the TCM wiring connector and terminal C46 of the ECM wiring connector.
  4. Measure the resistance between terminal A16 of the TCM wiring connector and terminal C63 of the ECM wiring connector.

Is the resistance within the values shown?		 0 Ω Go to Step 5 Go to Step 4
4 Repair the malfunctioning terminals as necessary.
Is the action complete?		 - System OK -
5
  1. Turn the ignition ON.
  2. Measure the voltage of terminal A8.
  3. Measure the voltage of terminal A16.

Is the voltage within the values shown?		 11 - 14 V Go to Step 6 Go to Step 7
6 Repair the short to power.
Is the action complete?		 - System OK -
7 Inspect the "Engine Speed". Refer to IGNITION SYSTEM CHECK .
Was a problem found?		 - Refer to IGNITION SYSTEM CHECK Go to Step 8
8
  1. Replace the TCM.
  2. Turn the ignition OFF.
  3. Turn the ignition ON.
  4. Check if P0726 DTC is set.

Is The DTC set?		 - Go to Step 9 Go to Step 10
9 Replace the ECM.
Is the action complete?		 - Go to Step 10 -
10
  1. After the repair, use a scan tool "clear info" function and road test the vehicle.
  2. Review the "DTC info".

Has the last test failed or is the current DTC displayed?		 - Begin diagnosis again Repair verified exit DTC chart
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