Tech Tip: Hyundai MIL On with DTCs Set and Fail Safe Mode, Harsh Engagement – UnderhoodService
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Tech Tip: Hyundai MIL On with DTCs Set and Fail Safe Mode, Harsh Engagement

An improperly functioning input speed sensor or output speed sensor may result in the following conditions: Check Engine light on; Harsh P-R or P-D engagement shock; Transaxle in third gear fail-safe; and/or Diagnostic trouble codes.

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Models affected:

1999 Sonata

2001 Elantra, Santa Fe and XG

2003 Tiburon

2005 Tucson

2006 Azera

2007 Entourage

fig. 1

Automatic transaxle DTCs: P0715, P0716, P0717, P0720, P0721 and P0722

An improperly functioning input speed sensor or output speed sensor (see Fig. 1) may result in the following conditions:

• Check Engine light on;

• Harsh P-R or P-D engagement shock;

• Transaxle in third gear fail-safe; and/or

• Diagnostic trouble codes.

 

Parts Information:

Input speed sensor: 42620-39051 or 42620-39200

Output speed sensor: 42621-39052 or 42621-39200

 

Service Procedure:

1. Using a GDS, check for DTCs in both the “Engine” and “Automatic Transaxle” menus. Record the DTC(s) and description.

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2. From the GDS, select:

Vehicle > “Auto Transaxle” menu > “Current Data” > “Input speed sensor” and “Output speed sensor.” Drive the vehicle and monitor the input and output speed sensors. If the sensors show:

– Continuous output, the wiring currently has no open/shorts. Go to Step 6.

– No output, go to Step 3.

3. Check the wiring harness visually for an open circuit or short circuit to ground. Check for a pinched harness at the PCM/TCM attachment bolts.fig. 2

4. Disconnect the connectors at the input and output speed sensor and PCM/TCM. Check for bent pins or pins not fully inserted into the connector.

5. If a harness open/short is found, repair or replace the ECM control harness between the PCM/TCM and transaxle and go to Step 8. If not, go to Step 6.Fig. 3

6. P0722 only: For 2006 and later Sonata and Azera, 2007 and later Santa Fe and Entourage vehicles, check the ground bolt at the location shown in Fig. 2 below and Fig. 3. Confirm the threads are clean and the bolt is tight.

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7. If the ground bolts are clean and tight, follow the repair procedures shown in Chart 1.

8. Drive the vehicle for two key-on to key-off driving cycles. If the codes:

– Do not set again, return the vehicle to the ­customer.

– Set again, go to step 8.

Chart 1
DTC       Description                    Repair Procedure
P0715    Input speed sensor         Replace input speed sensor
               – no signal       
P0716    Input speed sensor
               – range/performance
P0717    Input speed sensor
               – no signal

P0720    Output speed sensor circuit    Replace output speed sensor              
P0721    Output speed sensor
               – open/short
P0722    Output speed sensor
               – no signal

P0700,    TCM MIL request to ECM    Erase code
P1529
 

9. Exchange a PCM or TCM from a similar year and model vehicle (excluding vehicles with an immobilizer). If the codes:

– Set again, replace the control wiring harness.

– Do not set again, replace the PCM or TCM.

Courtesy of Mitchell 1.

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